VULNERABILITY INTELLIGENCE

CVE-2026-86143

CVSS score6.9 MEDIUM
EPSS probability0.19%
CISA KEVNot currently listed
Published2026-09-05
Last modified2026-09-15
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Description

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.

Weakness classification

  • cve@mitre.org: CWE-192

Primary references