CVE-2026-86140

CVE-2026-86140

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

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

Frequently asked questions

What is CVE-2026-86140?: CVE-2026-86140 is a high-severity vulnerability, classified under Stack-based Buffer Overflow. CVSS score: 8.0/10. Published 2026-09-05.
How severe is CVE-2026-86140?: High severity. CVSS v3 base score is 8.0 out of 10.