CVE-2026-34002: Red Hat Enterprise Linux

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.

Affected products

• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• X.org X Server: affected versions not specified

Published 2026-05-05. Last modified 2026-06-17.