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Full vulnerability report · 2026
CVE-2026-56132High confidence

libexpat project libexpat — Incorrect Synchronization

libexpat project · libexpat

6.9MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. 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 severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.10% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs libexpat project 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: As exposure requiresRemediation target: Within 365 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.2.8.2-r0Alpine Security Database ↗Source updated 3 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.2.8.2-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainexpatVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.2.8.2-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.8.2-1~deb13u1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourceexpatAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.8.2-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.8.2-1Debian Security Tracker ↗Source updated 6 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 5 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 5 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 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archiveexpatVendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.2.6.1-2ubuntu0.6Canonical Ubuntu Security ↗Source updated 5 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 5 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 5 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 5 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-2026-56132 · CSAF 2.0 · revision 7 · interimSUSE Product Security TeamCVE-2026-56132
169 known affected

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

  • 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
  • expat as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • libexpat1 as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • libexpat1-32bit as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • 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
  • expat as component of SUSE Linux Enterprise High Performance Computing 15 SP1
Summary
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-56132 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityexpat: libexpat: Arbitrary Code Execution via Heap-based Buffer Overflow
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 libexpat, a library used for parsing XML data. An attacker could exploit a heap-based buffer overflow, a type of memory error, by providing specially crafted XML input. This vulnerability occurs when the library mishandles memory reallocation while processing XML, particularly when multiple parsers share data. Successful exploitation could allow the attacker to execute arbitrary code, access sensitive information, or cause the application to crash, leading to a denial of service.
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
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-2026-37977

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

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
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. 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

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

What

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

Why

The product utilizes a shared resource in a concurrent manner, but it does not correctly synchronize access to the resource.

How

An attacker operating through local access 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

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

Why

The product utilizes a shared resource in a concurrent manner, but it does not correctly synchronize access to the resource.

How

An attacker operating through local access 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
local access → Incorrect Synchronization → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-821 ↗

CWE-821: Incorrect Synchronization. The product utilizes a shared resource in a concurrent manner, but it does not correctly synchronize access to the resource.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
UnauthenticatedCWE-821
A

Official authority intelligence

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

BSI · German · WID-SEC-2026-2008expat: Mehrere Schwachstellen

Ein lokaler Angreifer kann mehrere Schwachstellen in expat ausnutzen, um einen Denial of Service Angriff durchzuführen oder potentiell Code auszuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260624Security Bulletin 24 June 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 24 June 2026, published on 24 June 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1249Multiples vulnérabilités dans les produits VMware

ord?id=CVE-2026-53615 Référence CVE CVE-2026-53910 https://www.cve.org/CVERecord?id=CVE-2026-53910 Référence CVE CVE-2026-54272 https://www.cve.org/CVERecord?id=CVE-2026-54272 Référence CVE CVE-2026-5435 https://www.cve.org/CVERecord?id=CVE-2026-5435 Référence CVE CVE-2026-54369 https://www.cve.org/CVERecord?id=CVE-2026-54369 Référence CVE CVE-2026-54370 https://www.cve.org/CVERecord?id=CVE-2026-54370 Référence CVE CVE-2026-54371 https://www.cve.org/CVERecord?id=CVE-2026-54371 Référence CVE CVE-2026-54515 https://www.cve.org/CVERecord?id=CVE-2026-54515 Référence CVE CVE-2026-54874 https://www.cve.org/CVERecord?id=CVE-2026-54874 Référence CVE CVE-2026-56132 https://www.cve.org/CVERecord?id=CVE-2026-56132 Référence CVE CVE-2026-56392 https://www.cve.org/CVERecord?id=CVE-2026-56392 Référence CVE CVE-2026-56403 https://www.cve.org/CVERecord?id=CVE-2026-56403 Référence CVE CVE-2026-56404 https://www.cve.org/CVERecord?id=CVE-2026-56404 Référence CVE CVE-2026-56405 https://www.cve.org/CVERecord?id=CVE-2026-56405 Référence CVE CVE-2026-56408 https://www.cve.org/CVERecord?id=CVE-2026-56408 Référence CVE CVE-2026-56412 https://www.cve.org/CVERecord?id=CVE-2026-56412 Référence CVE CVE-2026-56846 https://www.cve.org/CVERecord?id=CVE-2026-56846 Référence CVE CVE-2026-56848 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-020942libexpat projectのlibexpatにおける不正な同期に関する脆弱性

libexpatのバージョン2.8.2より前には、xmlparse.cのdoPrologにヒープベースのバッファオーバーフローがあります。この問題は、パーサ間でデータ構造を共有している場合に、スキャフォールドのバック配列の再割り当てが誤って処理されることによって発生します。

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
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
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. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 19 Jun 2026 · Last source change 22 Jun 2026, 14:59 UTC · CWE-821 · Incorrect Synchronization

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 2026-08-14
European sourceENISA EUVD · EUVD-2026-37977
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCNA
NVD statusNVD enriched

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
    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_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 50 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_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 55 more
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    < 2.8.2 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    < 2.8.2 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-56132 to remediation: access.redhat.com/CVE-2026-56132.
    Before
    remediation: access.redhat.com/CVE-2026-56132
    After
    remediation: access.redhat.com/CVE-2026-56132
    Red Hat Product Security ↗
  4. 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-main@aarch64 as a component of Red Hat Hardened Images; expat-main@src as a component of Red Hat Hardened Images; expat-main@x86_64 as a component of Red Hat Hardened Images
    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_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.3.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.3.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.3.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.3.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 50 more
    Red Hat Product Security ↗
  5. 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 13 more · Fixed: expat-main@aarch64 as a component of Red Hat Hardened Images; expat-main@src as a component of Red Hat Hardened Images; expat-main@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; 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-main@aarch64 as a component of Red Hat Hardened Images; expat-main@src as a component of Red Hat Hardened Images; expat-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  6. 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; 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; 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; 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; expat as a component of Red Hat Enterprise Linux 9; expat-devel as a component of Red Hat Enterprise Linux 9; expat.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: expat-main@aarch64 as a component of Red Hat Hardened Images; expat-main@src as a component of Red Hat Hardened Images; expat-main@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; 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 13 more · Fixed: expat-main@aarch64 as a component of Red Hat Hardened Images; expat-main@src as a component of Red Hat Hardened Images; expat-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
Fixed release recorded from official guidance
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-37977↗Vendor CSAF · SUSE Product Security Team↗Red Hat Product Security security advisory↗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-2026-56132 · cve.blacktree.nl