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X.Org Foundation

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medium advisory

X.Org X11 Denial of Service Vulnerability

A vulnerability in X.Org X11 (CVE-2023-6478) allows a remote, authenticated attacker to trigger a Denial of Service condition through resource exhaustion.

X.Org X11 vulnerability denial-of-service
1t 1c
high threat

CVE-2026-55999 xorg-server / xwayland glamor font atlas Heap Buffer Overflow

A heap buffer overflow vulnerability, identified as CVE-2026-55999, has been discovered in the xorg-server and xwayland components, specifically within the glamor font atlas functionality, affecting systems using these display servers and potentially leading to arbitrary code execution or denial of service.

exploited xorg-server +1 cve vulnerability heap-overflow linux xorg xwayland
1c