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Libxml2 EUVDEUVD-2026-71822

| CVE-2026-86143 HIGH
Integer Coercion Error (CWE-192)
2026-09-05 mitre GHSA-r2q6-6v35-773j
Buffer Overflow Libxml2
7.3
CVSS 3.1 · NVD
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Severity by source

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

AV:L and AC:H because INT_MAX-scale output buffers are impractical without local/controlled large documents; C:H/I:H reflect callback-level memory corruption; A:L for incidental crash risk.

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
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
Low

Lifecycle Timeline

8
Analysis Updated
Sep 15, 2026 - 19:42 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 15, 2026 - 19:37 vuln.today
cvss_changed
Severity Changed
Sep 15, 2026 - 19:37 NVD
MEDIUM HIGH
CVSS changed
Sep 15, 2026 - 19:37 NVD
6.9 (MEDIUM) 7.3 (HIGH)
Patch available
Sep 05, 2026 - 06:01 EUVD
Source Code Evidence Fetched
Sep 05, 2026 - 05:00 vuln.today
Analysis Generated
Sep 05, 2026 - 05:00 vuln.today
CVE Published
Sep 05, 2026 - 04:31 cve.org
MEDIUM 6.9

DescriptionNVD

In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.

AnalysisAI

Integer-overflow handling in libxml2's xmlIO output path lets a negative length reach application-supplied write callbacks, allowing memory corruption or denial of service in programs that serialize large XML documents. All libxml2 builds before 2.15.4 are affected; the upstream commit 90f293ba adds INT_MAX guards to xmlOutputBufferWrite and xmlOutputBufferFlush and the fix ships in 2.15.4 (also distributed via RHSA-2026:64463). …

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Same weakness CWE-192 – Integer Coercion Error

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Vendor StatusVendor

SUSE

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

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EUVD-2026-71822 vulnerability details – vuln.today
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