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libxml2 CVE-2026-86142

| EUVDEUVD-2026-71835 MEDIUM
Heap-based Buffer Overflow (CWE-122)
2026-09-05 mitre GHSA-499q-6rmh-w6p7
Buffer Overflow Heap Overflow Libxml2 Xmlsoft
6.9
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
6.9 MEDIUM
AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
vuln.today AI
6.9 MEDIUM

Local vector confirmed by file-processing attack path; AC:H reflects precise integer saturation boundary; C:H/I:H for heap overflow code execution potential; A:L for likely process-level crash only.

3.1 AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
4.0 AV:L/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.9 MEDIUM
qualitative

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

Lifecycle Timeline

4
Patch available
Sep 05, 2026 - 06:01 EUVD
Source Code Evidence Fetched
Sep 05, 2026 - 04:59 vuln.today
Analysis Generated
Sep 05, 2026 - 04:59 vuln.today
CVE Published
Sep 05, 2026 - 04:29 cve.org
MEDIUM 6.9

DescriptionCVE.org

In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation.

AnalysisAI

Heap-based buffer overflow in libxml2 before 2.15.4 allows arbitrary code execution via a crafted XML document containing an excessively long XPointer expression. The root cause is integer length saturation in xmlStrlen within xmlXPtrEvalXPtrPart: when the XPointer string length overflows to zero, the subsequent heap allocation is undersized, enabling a controlled write beyond the buffer boundary. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Exploitation requires that: (1) the target application uses libxml2 before 2.15.4 and invokes the XPointer evaluation path (`xmlXPtrEval` / `xmlXPtrEvalXPtrPart`), and (2) the attacker can supply or influence an XML document containing an XPointer fragment of a length that causes `xmlStrlen` to integer-overflow to zero. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 6.9 (AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L) correctly reflects that exploitation requires supplying a locally-processed XML file with a precisely crafted XPointer expression - the high attack complexity (AC:H) accounts for the specific integer saturation boundary that must be hit. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade libxml2 to version 2.15.4 or later; this is the vendor-released patch confirmed by the GitHub commit 6b3a736c0edc74ceec3d82f5252499d7911b3a58 and the v2.15.3→v2.15.4 diff. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-122 – Heap-based Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected
SUSE Linux Enterprise Micro 5.5 Affected

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CVE-2026-86142 vulnerability details – vuln.today
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