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Libxml2 EUVDEUVD-2026-71831

| CVE-2026-86138 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-09-05 mitre GHSA-v4gg-2cxp-fc23
Buffer Overflow Integer Overflow Libxml2 Xmlsoft
7.8
CVSS 3.1 · NVD
Temporal: 6.9
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Severity by source

Vendor (mitre) PRIMARY
MEDIUM
qualitative
NVD
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.9 MEDIUM
cvss
vuln.today AI
7.7 HIGH

libxml2 routinely parses network-supplied XML in practice, warranting AV:N; AC:H reflects heap-grooming requirement for controlled exploitation beyond crash.

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

Primary rating from Vendor (mitre).

CVSS VectorNVD

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

Lifecycle Timeline

8
Analysis Updated
Sep 15, 2026 - 19:57 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 15, 2026 - 19:52 vuln.today
cvss_changed
Severity Changed
Sep 15, 2026 - 19:52 NVD
MEDIUM HIGH
CVSS changed
Sep 15, 2026 - 19:52 NVD
6.9 (MEDIUM) 7.8 (HIGH)
Patch available
Sep 05, 2026 - 06:01 EUVD
Source Code Evidence Fetched
Sep 05, 2026 - 04:43 vuln.today
Analysis Generated
Sep 05, 2026 - 04:43 vuln.today
CVE Published
Sep 05, 2026 - 04:21 cve.org
MEDIUM 6.9

DescriptionNVD

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

AnalysisAI

Heap-based buffer overflow in libxml2 before 2.15.4, reachable through the internal dictionary routine xmlDictAddQString() in dict.c, which miscalculates the size of an exponentially growing string pool and can be driven past the integer range before allocating. Per the vendor-assigned CVSS vector the attack is local with low privileges (AV:L/PR:L), so it primarily affects applications, daemons, or sandboxed services that parse attacker-influenced XML under a constrained account. …

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Same weakness CWE-190 – Integer Overflow or Wraparound

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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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EUVD-2026-71831 vulnerability details – vuln.today
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