| Name | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4678-1, DSA-6388-1 |
| Debian Bugs | 1141702 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libxfont (PTS) | bullseye | 1:2.0.4-1 | vulnerable |
| bullseye (security) | 1:2.0.4-1+deb11u1 | fixed |
| bookworm, trixie | 1:2.0.6-1 | vulnerable |
| bookworm (security) | 1:2.0.6-1+deb12u1 | fixed |
| trixie (security) | 1:2.0.6-1+deb13u1 | fixed |
| forky, sid | 1:2.0.8-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://www.openwall.com/lists/oss-security/2026/07/08/1
Fixed by: https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bb27b1439968811a3674 (libXfont2-2.0.8)