CVE-2026-121604
lowwlroots 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 h…
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.
CVSS
3.3
3.3 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-11-03 17:18
Modified: 2026-11-03 17:18
NVD status: Received
Last synced 1 day ago
Verified against the source API 2026-11-03 17:20 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/0.20.1/xwayland/xwm.c#L661-L678 disclosure@vulncheck.com
- https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/4412992469540b1d578cb94a5cd4e6e582... disclosure@vulncheck.com
- https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/851cdd0089004884bd85a95ad21f04009c... disclosure@vulncheck.com
- https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5374 disclosure@vulncheck.com
- https://gitlab.freedesktop.org/wlroots/wlroots/-/releases/0.20.2 disclosure@vulncheck.com
- https://gitlab.freedesktop.org/wlroots/wlroots/-/work_items/4092 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/wlroots-before-0.20.2-out-of-bounds-read-via-read-sur... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 17:20 UTC · record ↗