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Full vulnerability report · 2026
CVE-2026-45186High confidence

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input

libexpat project · libexpat

2.9LowCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Low technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 5 structured product or package states 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 severityLowOperational priority:Low, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 0.48% 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.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

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: No default targetRemediation target: Normal maintenance

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 5 structured product or package states 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.

15 package states
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.2.8.1-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.2.8.1-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.2.8.1-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 5 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 5 Oct 2026
Debian forkyforky · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.8.0-2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourceexpatVendor fix publishedDebian records a fixed source-package version for this release.2.8.0-2Debian Security Tracker ↗Source updated 5 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 5 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.2.6.1-2ubuntu0.5Canonical 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.

3 current
CVE-2026-45186 · CSAF 2.0 · revision 9 · interimSUSE Product Security TeamCVE-2026-45186
202 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 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-45186 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitylibexpat: denial of service via crafted XML input
31 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. When processing a specially crafted XML input containing a specific pattern of attributes, the parsing time increases quadratically due to checks for attribute name collisions. This consumes excessive CPU resources and eventually results in 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
SSA-082556 · CSAF 2.0 · revision 7 · interimSiemens ProductCERTSSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5
5 known affected

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

  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.5 < V3.1.6
  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.5 < V3.1.6
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.5 < V3.1.6
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= V3.1.5 < V3.1.6
  • SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= V3.1.5 < V3.1.6
Summary
In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
Remediation
Update to V3.1.6 or later version
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-2026-28985

No EUVD known-exploited evidence

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

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
2.9 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Low technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 5 structured product or package states 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 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

What

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

Why

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

Why

An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

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.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Inefficient Algorithmic Complexity → disrupt the affected service
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-407 ↗

CWE-407: Inefficient Algorithmic Complexity. An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

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:N/I:N/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.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.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.
UnauthenticatedDenial of serviceCWE-407Public exploit reference
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-28985Official EUVD mapping

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

Official EUVD record ↗
BSI · German · WID-SEC-2026-1685IBM HTTP Server: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM HTTP Server ausnutzen, um beliebigen Programmcode auszuführen und um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
BSI · German · WID-SEC-2026-1448expat: Schwachstelle ermöglicht Denial of Service

Ein lokaler Angreifer kann eine Schwachstelle in expat ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0986Multiples vulnérabilités dans les produits IBM

ecord?id=CVE-2026-43329 Référence CVE CVE-2026-43512 https://www.cve.org/CVERecord?id=CVE-2026-43512 Référence CVE CVE-2026-43513 https://www.cve.org/CVERecord?id=CVE-2026-43513 Référence CVE CVE-2026-43514 https://www.cve.org/CVERecord?id=CVE-2026-43514 Référence CVE CVE-2026-43515 https://www.cve.org/CVERecord?id=CVE-2026-43515 Référence CVE CVE-2026-43618 https://www.cve.org/CVERecord?id=CVE-2026-43618 Référence CVE CVE-2026-43964 https://www.cve.org/CVERecord?id=CVE-2026-43964 Référence CVE CVE-2026-4408 https://www.cve.org/CVERecord?id=CVE-2026-4408 Référence CVE CVE-2026-4480 https://www.cve.org/CVERecord?id=CVE-2026-4480 Référence CVE CVE-2026-45186 https://www.cve.org/CVERecord?id=CVE-2026-45186 Référence CVE CVE-2026-45447 https://www.cve.org/CVERecord?id=CVE-2026-45447 Référence CVE CVE-2026-45852 https://www.cve.org/CVERecord?id=CVE-2026-45852 Référence CVE CVE-2026-46056 https://www.cve.org/CVERecord?id=CVE-2026-46056 Référence CVE CVE-2026-46125 https://www.cve.org/CVERecord?id=CVE-2026-46125 Référence CVE CVE-2026-46152 https://www.cve.org/CVERecord?id=CVE-2026-46152 Référence CVE CVE-2026-46181 https://www.cve.org/CVERecord?id=CVE-2026-46181 Référence CVE CVE-2026-46243 https://www.cve.org/CVERecord?id=CVE-2026-46243 Référence CVE CVE-2026-46968 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-016041libexpat projectのlibexpatにおけるアルゴリズムの複雑さに関する脆弱性

libexpat 2.8.1 より前のバージョンには、属性名の衝突チェックの計算複雑度が高いため、適度なサイズの細工された XML 入力を使ってサービス拒否攻撃を実行できる脆弱性があります。

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
RHSA-2026:22715: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10)
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 10 May 2026 · Last source change 16 Sept 2026, 12:04 UTC · CWE-407 · Inefficient Algorithmic Complexity

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-2026-28985
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCNA
NVD statusNVD modified after 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
    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; 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; firefox.src as a component of Red Hat Enterprise Linux 9; thunderbird as a component of Red Hat Enterprise Linux 9; and 1 more · Fixed: expat-debuginfo-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 59 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; 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; firefox.src as a component of Red Hat Enterprise Linux 9; thunderbird as a component of Red Hat Enterprise Linux 9; and 1 more · Fixed: expat-debuginfo-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 58 more
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    < 2.8.1 · 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
    libexpat: < 2.8.1 · Fixed: RHSA-2026:22715: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10)
    CNA ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    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; 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 · Fixed: expat-debuginfo-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 59 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; 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; firefox.src as a component of Red Hat Enterprise Linux 9; thunderbird as a component of Red Hat Enterprise Linux 9; and 1 more · Fixed: expat-debuginfo-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debugsource-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-devel-0:2.7.3-1.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); expat-debuginfo-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debuginfo-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-debugsource-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-devel-0:2.5.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); expat-0:2.7.3-1.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); expat-0:2.7.3-1.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 59 more
    Red Hat Product Security ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: removed vendor advisory: access.redhat.com/RHSA-2026:58981.
    Before
    patch: github.com/1216 · remediation: github.com/1216 · vendor advisory: access.redhat.com/RHSA-2026:58981
    After
    patch: github.com/1216 · remediation: github.com/1216
    cve@mitre.org ↗
  5. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: access.redhat.com/RHSA-2026:58981.
    Before
    patch: github.com/1216 · remediation: github.com/1216
    After
    patch: github.com/1216 · remediation: github.com/1216 · vendor advisory: access.redhat.com/RHSA-2026:58981
    cve@mitre.org ↗
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-2026-28985↗Vendor CSAF · SUSE Product Security Team↗Public exploit 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-2026-45186 · cve.blacktree.nl