[ CVE-2026-121604 · Published 3 Nov 2026 ]
Vulnerability in wlroots
CVSS 3.3
EPSS <1%No fix listed yet
[ Description ]Official description
wlroots before 0.20.2 contains an out-of-bounds read vulnerability in read_surface_class() in xwayland/xwm.c that allows local X11 clients to leak compositor heap memory. Attackers can set a WM_CLASS property with a NUL-terminated instance but unterminated class, exposing over-read heap bytes as the window class or app_id over IPC.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ References ]References
- gitlab.freedesktop.org/wlroots/wlroots/-/blob/0.20.1/xwayland/xwm.c
- gitlab.freedesktop.org/wlroots/wlroots/-/commit/4412992469540b1d578cb94a5cd4e6e5829812dc
- gitlab.freedesktop.org/wlroots/wlroots/-/commit/851cdd0089004884bd85a95ad21f04009cb5a53a
- gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5374
- gitlab.freedesktop.org/wlroots/wlroots/-/releases/0.20.2
- gitlab.freedesktop.org/wlroots/wlroots/-/work_items/4092
- www.vulncheck.com/advisories/wlroots-before-0.20.2-out-of-bounds-read-via-read-surface-…