Out-of-bounds read in X.org Server and Xwayland - CVE-2026-34000
Published: April 14, 2026
Vulnerability identifier: #VU125988
CSH Severity: Low
CVSS 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:U/U:Clear
CVE-ID: CVE-2026-34000
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: X.org
Affected software:
X.org Server
Xwayland
X.org Server
Xwayland
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in CheckSetGeom() when handling key alias entries and validating only the first key name. A local user can gain access to sensitive information.
How to mitigate CVE-2026-34000
Install security update from vendor's website.