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Full vulnerability report · 2026
CVE-2026-93990High confidence

Expat before 2.8.5 Malformed UTF-16 Acceptance via Unchecked Surrogate

libexpat · libexpat

8.7HighCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.40% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs libexpat libexpat and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Alpine, Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

14 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainexpatVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.8.5-r0Alpine Security Database ↗Source updated 6 Oct 2026
Alpine v3.22v3.22 · mainexpatVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.8.5-r0Alpine Security Database ↗Source updated 6 Oct 2026
Debian trixietrixie · sourceexpatAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 7 Oct 2026
Debian bookwormbookworm · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.5.0-1+deb12u4Debian Security Tracker ↗Source updated 7 Oct 2026
Debian forkyforky · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.8.4-2Debian Security Tracker ↗Source updated 7 Oct 2026
Debian sidsid · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.8.4-2Debian Security Tracker ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appslibxmltokUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appsswish-eUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appsxmlrpc-cUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivecadaverUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · standard archiveexpatUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivematanzaUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivetdomUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivewbxml2Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 7 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2026-93990 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityexpat: Expat: XML Injection via Malformed UTF-16 Input
35 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • firefox as a component of Red Hat Enterprise Linux 10
  • firefox.src as a component of Red Hat Enterprise Linux 10
  • thunderbird as a component of Red Hat Enterprise Linux 10
  • thunderbird.src as a component of Red Hat Enterprise Linux 10
  • compat-expat1 as a component of Red Hat Enterprise Linux 6
  • compat-expat1.src as a component of Red Hat Enterprise Linux 6
  • expat as a component of Red Hat Enterprise Linux 6
  • expat-devel as a component of Red Hat Enterprise Linux 6
  • expat.src as a component of Red Hat Enterprise Linux 6
  • expat as a component of Red Hat Enterprise Linux 7
  • expat-devel as a component of Red Hat Enterprise Linux 7
  • expat-static as a component of Red Hat Enterprise Linux 7
Summary
A flaw was found in Expat. This vulnerability allows a remote attacker to send specially crafted UTF-16 encoded XML data. Due to improper validation of surrogate characters, the parser can be tricked into accepting malformed sequences, which can hide legitimate markup characters. This could enable XML injection attacks, potentially leading to information disclosure or other integrity impacts.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
CVE-2026-93990 · CSAF 2.0 · revision 4 · interimSUSE Product Security TeamCVE-2026-93990
327 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • MozillaFirefox as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaThunderbird-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7
  • expat as component of SUSE Linux Enterprise Desktop 15 SP7
  • libexpat-devel as component of SUSE Linux Enterprise Desktop 15 SP7
  • libexpat1 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libexpat1-32bit as component of SUSE Linux Enterprise Desktop 15 SP7
  • MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 12 SP5
Summary
Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-83618

No EUVD known-exploited evidence

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
8.7 · CVSS 4.0
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

What

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

Why

The product does not properly handle when an input contains Unicode encoding.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

Why

The product does not properly handle when an input contains Unicode encoding.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Handling of Unicode Encoding → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-176 ↗

CWE-176: Improper Handling of Unicode Encoding. The product does not properly handle when an input contains Unicode encoding.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-176
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-83618Official EUVD mapping

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3482expat: Schwachstelle ermöglicht Manipulation von Daten

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in expat ausnutzen, um Daten zu manipulieren.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 19 Sept 2026 · Last source change 28 Sept 2026, 16:11 UTC · CWE-176 · Improper Handling of Unicode Encoding

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-20
European sourceENISA EUVD · EUVD-2026-83618
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-devel as a component of Red Hat Enterprise Linux 8; and 8 more · Fixed: expat-debuginfo-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.src as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); and 29 more
    After
    firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-devel as a component of Red Hat Enterprise Linux 8; xmlrpc-c.src as a component of Red Hat Enterprise Linux 8; firefox as a component of Red Hat Enterprise Linux 9; firefox-x11 as a component of Red Hat Enterprise Linux 9; and 5 more · Fixed: expat-debuginfo-0:2.7.3-1.el10_2.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.5.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 54 more
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-devel as a component of Red Hat Enterprise Linux 8; and 11 more · Fixed: expat-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.src as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@src as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images
    After
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-devel as a component of Red Hat Enterprise Linux 8; and 8 more · Fixed: expat-debuginfo-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.src as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); and 29 more
    Red Hat Product Security ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: suse.com/CVE-2026-93990 to remediation: suse.com/CVE-2026-93990.
    Before
    remediation: suse.com/CVE-2026-93990
    After
    remediation: suse.com/CVE-2026-93990
    SUSE Product Security Team ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    SUSE Product Security Team ↗
  5. Vendor guidanceAuthoritative vendor guidance changed: added remediation: github.com/1282; removed remediation: github.com/R_2_8_5; removed vendor advisory: blog.hartwork.org/expat-2-8-5-released.
    Before
    remediation: github.com/R_2_8_5 · vendor advisory: blog.hartwork.org/expat-2-8-5-released
    After
    remediation: github.com/1282
    CNA ↗
  6. Vendor guidanceAuthoritative vendor guidance changed: added remediation: github.com/R_2_8_5; added vendor advisory: blog.hartwork.org/expat-2-8-5-released; removed remediation: access.redhat.com/CVE-2026-93990.
    Before
    remediation: access.redhat.com/CVE-2026-93990
    After
    remediation: github.com/R_2_8_5 · vendor advisory: blog.hartwork.org/expat-2-8-5-released
    github.com ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    libexpat: ≤ 2.8.4 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
    After
    libexpat: < 2.8.5 · Fixed: libexpat: 2.8.5
    CNA ↗
  8. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-93990 to remediation: access.redhat.com/CVE-2026-93990.
    Before
    remediation: access.redhat.com/CVE-2026-93990
    After
    remediation: access.redhat.com/CVE-2026-93990
    Red Hat Product Security ↗
  9. Affected versionsThe structured affected or fixed version information changed.
    Before
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; expat as a component of Red Hat Enterprise Linux 8; expat-devel as a component of Red Hat Enterprise Linux 8; expat.src as a component of Red Hat Enterprise Linux 8; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; and 14 more · Fixed: expat-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@src as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images
    After
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client as a component of Red Hat Enterprise Linux 8; xmlrpc-c-client++ as a component of Red Hat Enterprise Linux 8; xmlrpc-c-devel as a component of Red Hat Enterprise Linux 8; and 11 more · Fixed: expat-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.src as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debuginfo-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-debugsource-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-devel-0:2.5.0-4.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8); expat-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@src as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  10. Affected versionsThe structured affected or fixed version information changed.
    Before
    After
    MozillaFirefox as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox-devel as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaThunderbird as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaThunderbird-translations-common as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaThunderbird-translations-other as component of SUSE Linux Enterprise Desktop 15 SP7; expat as component of SUSE Linux Enterprise Desktop 15 SP7; libexpat-devel as component of SUSE Linux Enterprise Desktop 15 SP7; libexpat1 as component of SUSE Linux Enterprise Desktop 15 SP7; libexpat1-32bit as component of SUSE Linux Enterprise Desktop 15 SP7; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 12 SP5; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 12 SP5; expat as component of SUSE Linux Enterprise High Performance Computing 12 SP5; libexpat-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5; libexpat1 as component of SUSE Linux Enterprise High Performance Computing 12 SP5; libexpat1-32bit as component of SUSE Linux Enterprise High Performance Computing 12 SP5; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP1; expat as component of SUSE Linux Enterprise High Performance Computing 15 SP1; libexpat-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1; libexpat1 as component of SUSE Linux Enterprise High Performance Computing 15 SP1; libexpat1-32bit as component of SUSE Linux Enterprise High Performance Computing 15 SP1; MozillaFirefox as component of SUSE Linux Enterprise High Performance Computing 15 SP2; MozillaFirefox-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP2; MozillaFirefox-translations-common as component of SUSE Linux Enterprise High Performance Computing 15 SP2; MozillaFirefox-translations-other as component of SUSE Linux Enterprise High Performance Computing 15 SP2; and 297 more
    SUSE Product Security Team ↗
  11. Affected versionsThe structured affected or fixed version information changed.
    Before
    libexpat: ≤ 2.8.4 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    libexpat: ≤ 2.8.4 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
    Red Hat Product Security ↗
  12. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
  13. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-93990 to remediation: access.redhat.com/CVE-2026-93990.
    Before
    remediation: access.redhat.com/CVE-2026-93990
    After
    remediation: access.redhat.com/CVE-2026-93990
    Red Hat Product Security ↗
  14. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  15. Affected versionsThe structured affected or fixed version information changed.
    Before
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; expat as a component of Red Hat Enterprise Linux 8; expat-devel as a component of Red Hat Enterprise Linux 8; expat.src as a component of Red Hat Enterprise Linux 8; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; and 15 more
    After
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; expat as a component of Red Hat Enterprise Linux 8; expat-devel as a component of Red Hat Enterprise Linux 8; expat.src as a component of Red Hat Enterprise Linux 8; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; and 14 more · Fixed: expat-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@src as a component of Red Hat Hardened Images; expat-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-devel-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@aarch64 as a component of Red Hat Hardened Images; expat-static-0:2.8.4-0.2.hum1@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  16. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-93990 to remediation: access.redhat.com/CVE-2026-93990.
    Before
    remediation: access.redhat.com/CVE-2026-93990
    After
    remediation: access.redhat.com/CVE-2026-93990
    Red Hat Product Security ↗
  17. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    Red Hat Product Security ↗
  18. Affected versionsThe structured affected or fixed version information changed.
    Before
    openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4
    After
    expat as a component of Red Hat Enterprise Linux 10; expat-devel as a component of Red Hat Enterprise Linux 10; expat.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; thunderbird as a component of Red Hat Enterprise Linux 10; thunderbird.src as a component of Red Hat Enterprise Linux 10; compat-expat1 as a component of Red Hat Enterprise Linux 6; compat-expat1.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 6; expat-devel as a component of Red Hat Enterprise Linux 6; expat.src as a component of Red Hat Enterprise Linux 6; expat as a component of Red Hat Enterprise Linux 7; expat-devel as a component of Red Hat Enterprise Linux 7; expat-static as a component of Red Hat Enterprise Linux 7; expat.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; expat as a component of Red Hat Enterprise Linux 8; expat-devel as a component of Red Hat Enterprise Linux 8; expat.src as a component of Red Hat Enterprise Linux 8; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; mingw-expat.src as a component of Red Hat Enterprise Linux 8; mingw32-expat as a component of Red Hat Enterprise Linux 8; mingw64-expat as a component of Red Hat Enterprise Linux 8; thunderbird as a component of Red Hat Enterprise Linux 8; thunderbird.src as a component of Red Hat Enterprise Linux 8; xmlrpc-c as a component of Red Hat Enterprise Linux 8; xmlrpc-c-c++ as a component of Red Hat Enterprise Linux 8; and 15 more
    Red Hat Product Security ↗
  19. ENISA EUVD mappingEUVD-2026-83618 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-83618"}
    ENISA EUVD ↗
  20. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-83618↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-93990 · cve.blacktree.nl