This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-55999 →

DEBIAN-CVE-2026-55999

Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a h...

Original description

The description as published by the source.

Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 xorg-server

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 xorg-server

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:21.1.16-1.3+deb13u4"}]}]

Debian:14 xorg-server

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:21.1.24-1"}]}]

Debian:12 xwayland

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 xwayland

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 xwayland

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:24.1.13-1"}]}]

References

advisory security-tracker.debian.org