CVE-2025-26596 — Out-of-bounds Write in Xwayland

CWE-787 — Out-of-bounds WriteCWE-122 — Heap-based Buffer Overflow12 documents9 sources
Severity
7.8HIGHNVD
EPSS
0.0%
top 94.28%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
X.org Xorg-serverX.org XwaylandX.org X Server+1 more
Timeline
PublishedFeb 25
Latest updateMar 17

Description

A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages4 packages

▶NVDx.org/xwayland< 24.1.6
▶Debianx.org/xwayland< 2:24.1.6-1+1
▶NVDx.org/x_server< 21.1.16
▶Debianx.org/xorg-server< 2:1.20.11-1+deb11u15+3

Also affects: Enterprise Linux 7.0, 8.0, 9.0

🔴Vulnerability Details

3
OSV
CVE-2025-26596: A heap overflow flaw was found in X↗2025-02-25
▶
CVEList
Xorg: xwayland: heap overflow in xkbwritekeysyms()↗2025-02-25
▶
GHSA
GHSA-c52f-45m8-h2r6: A heap overflow flaw was found in X↗2025-02-25
▶

📋Vendor Advisories

8
Ubuntu
X.Org X Server regression↗2025-03-17
▶
Ubuntu
X.Org X Server vulnerabilities↗2025-03-10
▶
BSD
OpenBSD 7.5 Errata 018: SECURITY FIX↗2025-02-25
▶
Ubuntu
X.Org X Server vulnerabilities↗2025-02-25
▶
Red Hat
xorg: xwayland: Heap overflow in XkbWriteKeySyms()↗2025-02-25
▶
CVE-2025-26596 — Out-of-bounds Write in X.org Xwayland | cvebase