CVE-2026-50256: Red Hat Enterprise Linux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Affected products

• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• X.org X Server: before 21.1.23 (fixed in 21.1.23)
• X.org Xwayland: before 24.1.12 (fixed in 24.1.12)

Published 2026-06-05. Last modified 2026-08-05.