What is GHSA-r49w-hq6h-2w8q?

GHSA-r49w-hq6h-2w8q is a security advisory published by GitHub Security Advisories with High severity. A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8...

Which CVE IDs does GHSA-r49w-hq6h-2w8q cover?

GHSA-r49w-hq6h-2w8q covers the following CVE IDs: CVE-2026-56002. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-r49w-hq6h-2w8q?

GHSA-r49w-hq6h-2w8q has a CVSS v3 base score of 8.5, published by GitHub Security Advisories.

GHSA-r49w-hq6h-2w8qHighCVSS 8.5

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8...

Vendor

GitHub Security Advisories

Published

July 8, 2026

Last Modified

July 8, 2026

🔗 CVE IDs covered (1)

CVE-2026-56002 →

📋 Description

A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8 allows attackers authenticated as X client to execute code within the X server.

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-56002
https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674
https://www.openwall.com/lists/oss-security/2026/07/08/1
https://github.com/advisories/GHSA-r49w-hq6h-2w8q