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Full vulnerability report · 2026
CVE-2026-86140High confidence

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow

xmlsoft · libxml2

8.0HighCVSS 3.1
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 2 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 severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.16% 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 xmlsoft libxml2 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 2 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

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

5 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 2 affected package states 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
Debian trixietrixie · sourcelibxml2Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcelibxml2Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcelibxml2Vendor fix publishedDebian records a fixed source-package version for this release.2.15.4+dfsg-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcelibxml2Vendor fix publishedDebian records a fixed source-package version for this release.2.15.4+dfsg-1Debian Security Tracker ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelibxml2Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.2.9.14+dfsg-1.3ubuntu3.9Canonical 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.

1 current
CVE-2026-86140 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitylibxml2: libxml2: Arbitrary code execution via stack-based buffer overflow in xmlSnprintfElements
12 known affected

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

  • libxml2 as a component of Red Hat Enterprise Linux 6
  • libxml2-devel as a component of Red Hat Enterprise Linux 6
  • libxml2-python as a component of Red Hat Enterprise Linux 6
  • libxml2-static as a component of Red Hat Enterprise Linux 6
  • libxml2.src as a component of Red Hat Enterprise Linux 6
  • libxml2 as a component of Red Hat Enterprise Linux 7
  • libxml2-devel as a component of Red Hat Enterprise Linux 7
  • libxml2-python as a component of Red Hat Enterprise Linux 7
  • libxml2-static as a component of Red Hat Enterprise Linux 7
  • libxml2.src as a component of Red Hat Enterprise Linux 7
  • 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
Summary
A flaw was found in libxml2. A local attacker could exploit a stack-based buffer overflow in the `xmlSnprintfElements` function to achieve arbitrary code execution. This vulnerability in a fundamental system library could lead to significant system compromise if successfully exploited.
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-2026-71833

No EUVD known-exploited evidence

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

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
8.0 · CVSS 3.1
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 2 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 libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

What

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

Why

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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 libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

Why

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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 → Stack-based Buffer Overflow → 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
Low: no specialised conditions are recorded
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-121 ↗

CWE-121: Stack-based Buffer Overflow. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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:L/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.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.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-121
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-71833Official EUVD mapping

In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3642Meinberg LANTIME: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Meinberg LANTIME ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten offenzulegen oder zu manipulieren, Denial-of-Service-Zustände herbeizuführen, sowie weitere, nicht näher spezifizierte Angriffe zu starten.

Official advisory ↗
BSI · German · WID-SEC-2026-3195libxml2: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in libxml2 ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Daten zu manipulieren oder offenzulegen und um einen Denial of Service herbeizuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260909Security Bulletin 9 Sep 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 9 Sep 2026, published on 9 September 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-033763xmlsoft.orgのlibxml2におけるスタックベースのバッファオーバーフローの脆弱性

libxml2のバージョン2.15.4より前のバージョンにおいて、valid.cのxmlSnprintfElements関数でstrcatを使用したため、スタックベースのバッファオーバーフローが発生します。

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
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 5 Sept 2026 · Last source change 8 Sept 2026, 18:06 UTC · CWE-121 · Stack-based Buffer Overflow

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 2026-09-06
European sourceENISA EUVD · EUVD-2026-71833
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
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
    libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; 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 · Fixed: libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); and 116 more
    After
    libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; 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 · Fixed: libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); and 128 more
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; libxml2 as a component of Red Hat Enterprise Linux 9; libxml2-devel as a component of Red Hat Enterprise Linux 9; libxml2.src as a component of Red Hat Enterprise Linux 9; python3-libxml2 as a component of Red Hat Enterprise Linux 9; 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 · Fixed: libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); and 71 more
    After
    libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; 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 · Fixed: libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); and 116 more
    Red Hat Product Security ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    libxml2: < 2.15.4 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
    After
    libxml2: < 2.15.4 · 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 ↗
  4. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-86140 to remediation: access.redhat.com/CVE-2026-86140.
    Before
    remediation: access.redhat.com/CVE-2026-86140
    After
    remediation: access.redhat.com/CVE-2026-86140
    Red Hat Product Security ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    libxml2 as a component of Red Hat Enterprise Linux 10; libxml2-devel as a component of Red Hat Enterprise Linux 10; libxml2-static as a component of Red Hat Enterprise Linux 10; libxml2.src as a component of Red Hat Enterprise Linux 10; python3-libxml2 as a component of Red Hat Enterprise Linux 10; libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; libxml2 as a component of Red Hat Enterprise Linux 8; libxml2-devel as a component of Red Hat Enterprise Linux 8; libxml2.src as a component of Red Hat Enterprise Linux 8; python3-libxml2 as a component of Red Hat Enterprise Linux 8; libxml2 as a component of Red Hat Enterprise Linux 9; libxml2-devel as a component of Red Hat Enterprise Linux 9; libxml2.src as a component of Red Hat Enterprise Linux 9; python3-libxml2 as a component of Red Hat Enterprise Linux 9; 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 · Fixed: libxml2-main@aarch64 as a component of Red Hat Hardened Images; libxml2-main@src as a component of Red Hat Hardened Images; libxml2-main@x86_64 as a component of Red Hat Hardened Images
    After
    libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; libxml2 as a component of Red Hat Enterprise Linux 9; libxml2-devel as a component of Red Hat Enterprise Linux 9; libxml2.src as a component of Red Hat Enterprise Linux 9; python3-libxml2 as a component of Red Hat Enterprise Linux 9; 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 · Fixed: libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debugsource-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-devel-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); python3-libxml2-debuginfo-0:2.12.5-10.el10_2.4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); libxml2-debuginfo-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debuginfo-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-debugsource-0:2.9.7-21.el8_10.9.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8); libxml2-devel-0:2.9.7-21.el8_10.9.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8); and 71 more
    Red Hat Product Security ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    libxml2: < 2.15.4 · 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
    libxml2: < 2.15.4 · 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 ↗
  7. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-86140 to remediation: access.redhat.com/CVE-2026-86140.
    Before
    remediation: access.redhat.com/CVE-2026-86140
    After
    remediation: access.redhat.com/CVE-2026-86140
    Red Hat Product Security ↗
  8. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  9. Affected versionsThe structured affected or fixed version information changed.
    Before
    libxml2 as a component of Red Hat Enterprise Linux 10; libxml2-devel as a component of Red Hat Enterprise Linux 10; libxml2-static as a component of Red Hat Enterprise Linux 10; libxml2.src as a component of Red Hat Enterprise Linux 10; python3-libxml2 as a component of Red Hat Enterprise Linux 10; libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; libxml2 as a component of Red Hat Enterprise Linux 8; libxml2-devel as a component of Red Hat Enterprise Linux 8; libxml2.src as a component of Red Hat Enterprise Linux 8; python3-libxml2 as a component of Red Hat Enterprise Linux 8; libxml2 as a component of Red Hat Enterprise Linux 9; libxml2-devel as a component of Red Hat Enterprise Linux 9; libxml2.src as a component of Red Hat Enterprise Linux 9; python3-libxml2 as a component of Red Hat Enterprise Linux 9; libxml2.src as a component of Red Hat Hardened Images; 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
    libxml2 as a component of Red Hat Enterprise Linux 10; libxml2-devel as a component of Red Hat Enterprise Linux 10; libxml2-static as a component of Red Hat Enterprise Linux 10; libxml2.src as a component of Red Hat Enterprise Linux 10; python3-libxml2 as a component of Red Hat Enterprise Linux 10; libxml2 as a component of Red Hat Enterprise Linux 6; libxml2-devel as a component of Red Hat Enterprise Linux 6; libxml2-python as a component of Red Hat Enterprise Linux 6; libxml2-static as a component of Red Hat Enterprise Linux 6; libxml2.src as a component of Red Hat Enterprise Linux 6; libxml2 as a component of Red Hat Enterprise Linux 7; libxml2-devel as a component of Red Hat Enterprise Linux 7; libxml2-python as a component of Red Hat Enterprise Linux 7; libxml2-static as a component of Red Hat Enterprise Linux 7; libxml2.src as a component of Red Hat Enterprise Linux 7; libxml2 as a component of Red Hat Enterprise Linux 8; libxml2-devel as a component of Red Hat Enterprise Linux 8; libxml2.src as a component of Red Hat Enterprise Linux 8; python3-libxml2 as a component of Red Hat Enterprise Linux 8; libxml2 as a component of Red Hat Enterprise Linux 9; libxml2-devel as a component of Red Hat Enterprise Linux 9; libxml2.src as a component of Red Hat Enterprise Linux 9; python3-libxml2 as a component of Red Hat Enterprise Linux 9; 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 · Fixed: libxml2-main@aarch64 as a component of Red Hat Hardened Images; libxml2-main@src as a component of Red Hat Hardened Images; libxml2-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  10. Vendor guidanceAuthoritative vendor guidance changed: added patch: github.com/d1686f91dbda141a752200419d35639fd6b38340; added remediation: github.com/d1686f91dbda141a752200419d35639fd6b38340.
    Before
    no authoritative guidance recorded
    After
    patch: github.com/d1686f91dbda141a752200419d35639fd6b38340 · remediation: github.com/d1686f91dbda141a752200419d35639fd6b38340
    cve@mitre.org ↗
  11. Affected versionsThe structured affected or fixed version information changed.
    Before
    < 2.15.4 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    libxml2: < 2.15.4 · 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.
    CNA ↗
  12. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    cve@mitre.org ↗
  13. ENISA EUVD mappingEUVD-2026-71833 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-71833"}
    ENISA EUVD ↗
  14. 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
Fixed release recorded from official guidance
Fixed release recorded from official guidance
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-71833↗Red Hat Product Security security advisory↗Patch or update reference↗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-2026-86140 · cve.blacktree.nl