Dashboard / CVE-2026-121604

CVE-2026-121604

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 35/100
Published: 2026-11-03 Modified: 2026-11-12 First seen: 2026-11-03 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: X
AT: None
VC: Low
VI: None
VA: None

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
wlroots wlroots 0 < 0.20.2
wlroots wlroots 0 < 0.20.2

References & Advisories (7)

Bug Bounty Relevance

35 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

4.8 / 10.0 v4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.11%
Raw Score 0.001110
Percentile 1.4%
Date 2026-11-14

EPSS Trend

2026-11-14
0.00111
2026-11-13
0.00111
2026-11-12
0.00111
2026-11-10
0.00111
2026-11-09
0.00111
2026-11-08
0.00111
2026-11-07
0.00111
2026-11-06
0.00111
2026-11-05
0.00111
2026-11-04
0.00111

Intelligence Sources

mitre ref →
nvd ref →

External Links