CVE-2026-33999
HIGH
NVD
CVSS Score
7.8
Severity
HIGH
Published
Apr 23, 2026
Vendor
unknown
Description
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.