What is GHSA-6wmc-mmch-49h7?

GHSA-6wmc-mmch-49h7 is a security advisory published by GitHub Security Advisories with High severity. In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.

Which CVE IDs does GHSA-6wmc-mmch-49h7 cover?

GHSA-6wmc-mmch-49h7 covers the following CVE IDs: CVE-2026-86140. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-6wmc-mmch-49h7?

GHSA-6wmc-mmch-49h7 has a CVSS v3 base score of 8.0, published by GitHub Security Advisories.

GHSA-6wmc-mmch-49h7HighCVSS 8.0

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

Vendor

GitHub Security Advisories

Published

September 5, 2026

Last Modified

September 5, 2026

🔗 CVE IDs covered (1)

CVE-2026-86140 →

📋 Description

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

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-86140
https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340
https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4
https://github.com/advisories/GHSA-6wmc-mmch-49h7