CVE-2026-55999 | X.Org xorg-server/xwayland prior 21.2.24/24.1.13 Font Processing SetFont heap-based overflow

A vulnerability described as very critical has been identified in X.Org xorg-server and xwayland. This vulnerability affects the function SetFont of the component Font Processing. Such manipulation leads to heap-based buffer overflow.

This vulnerability is listed as CVE-2026-55999. The attack must be carried out locally. There is no available exploit.