MEDIUM 4.8 NVD
CVE-2026-121604
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 he
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.
References
- https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/0.20.1/xwayland/xwm.c#L661-L678
- https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/4412992469540b1d578cb94a5cd4e6e582
- https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/851cdd0089004884bd85a95ad21f04009c
- https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5374
- https://gitlab.freedesktop.org/wlroots/wlroots/-/releases/0.20.2
This medium severity vulnerability with a CVSS score of 4.8 was published on 2026-11-03 via NVD.
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