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.

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Wlroots
  • Wlroots

No data.

No data.

References
Link Providers
https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/0.20.1/xwayland/xwm.c#L661-L678 cve-icon cve-icon
https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/4412992469540b1d578cb94a5cd4e6e5829812dc cve-icon cve-icon
https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/851cdd0089004884bd85a95ad21f04009cb5a53a cve-icon cve-icon
https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/5374 cve-icon cve-icon
https://gitlab.freedesktop.org/wlroots/wlroots/-/releases/0.20.2 cve-icon cve-icon
https://gitlab.freedesktop.org/wlroots/wlroots/-/work_items/4092 cve-icon cve-icon
https://www.vulncheck.com/advisories/wlroots-before-0.20.2-out-of-bounds-read-via-read-surface-class-in-xwm-c cve-icon cve-icon
History

Sat, 07 Nov 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 06 Nov 2026 22:00:00 +0000

Type Values Removed Values Added
First Time appeared Wlroots
Wlroots wlroots
Vendors & Products Wlroots
Wlroots wlroots

Tue, 03 Nov 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title wlroots before 0.20.2 Out-of-Bounds Read via read_surface_class() in xwm.c
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-11-03T16:26:55.569Z

Updated: 2026-11-07T03:14:36.532Z

Reserved: 2026-11-03T16:19:16.465Z

Link: CVE-2026-121604

cve-icon Vulnrichment

Updated: 2026-11-07T03:14:30.425Z

cve-icon NVD

Status : Received

Published: 2026-11-03T17:18:11.737

Modified: 2026-11-07T04:17:26.520

Link: CVE-2026-121604

cve-icon Redhat

No data.