Low severity3.3NVD Advisory· Published Nov 3, 2026
CVE-2026-121604
CVE-2026-121604
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.
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Affected products
1Patches
Vulnerability mechanics
References
6- gitlab.freedesktop.org/wlroots/wlroots/-/blob/0.20.1/xwayland/xwm.cnvd
- gitlab.freedesktop.org/wlroots/wlroots/-/commit/4412992469540b1d578cb94a5cd4e6e5829812dcnvd
- gitlab.freedesktop.org/wlroots/wlroots/-/commit/851cdd0089004884bd85a95ad21f04009cb5a53anvd
- gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5374nvd
- gitlab.freedesktop.org/wlroots/wlroots/-/releases/0.20.2nvd
- www.vulncheck.com/advisories/wlroots-before-0.20.2-out-of-bounds-read-via-read-surface-class-in-xwm-cnvd
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