Security Advisory
CVE-2026-55999
8.5
HIGH
Vulnerability Description
Local attackers with a X connection able to provide PCX fonts to the X
server xorg-server before 21.2.24 and xwayland before 24.1.13 could
cause a heap buffer overflow via SetFont due to missing glyph boundary checks.
Published Date
July 8, 2026
Official Source
NIST NVD Advisory