CVE-2026-86140

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

Scoring

Severity

HIGH

CVSS base score

8

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS probability

0.14%

CWE

CWE-121

Published

2026-09-05

Last modified

2026-09-08

Affected products

• xmlsoft libxml2

Weakness type

• CWE-121

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