{"id":"CVE-2026-121604","title":"wlroots before 0.20.2 Out-of-Bounds Read via read_surface_class() in xwm.c","summary":"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 instan…","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-125"],"vendor":"wlroots","product":"wlroots","affected":["wlroots < 0.20.2"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-07T03:14:25.336787Z"},"published":"2026-11-03","updated":"2026-11-07","sourceUpdated":"2026-11-07T03:14:36.532Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-121604","references":[{"url":"https://gitlab.freedesktop.org/wlroots/wlroots/-/work_items/4092"},{"url":"https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5374"},{"url":"https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/851cdd0089004884bd85a95ad21f04009cb5a53a"},{"url":"https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/4412992469540b1d578cb94a5cd4e6e5829812dc"},{"url":"https://gitlab.freedesktop.org/wlroots/wlroots/-/releases/0.20.2"},{"url":"https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/0.20.1/xwayland/xwm.c#L661-L678"},{"url":"https://www.vulncheck.com/advisories/wlroots-before-0.20.2-out-of-bounds-read-via-read-surface-class-in-xwm-c","label":"VulnCheck Advisory: wlroots before 0.20.2 Out-of-Bounds Read via read_surface_class() in xwm.c"}],"tags":["cve.org"],"epss":0.00111,"epssPercentile":0.01344,"ingestedAt":"2026-11-05T20:33:06.285Z","slug":"CVE-2026-121604","body":"## Overview\n\nwlroots 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.\n\n## Affected\n\n- `wlroots < 0.20.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":18,"depthScoreParts":{"impact":18.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}