{"id":"CVE-2026-93520","title":"X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write","summary":"A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and  ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially exe…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"x.org","product":"xorg-x11-server","affected":["xorg-x11-server < 21.1.25","xwayland < 24.1.14"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T14:59:50.140Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93520","references":[{"url":"https://gitlab.freedesktop.org/xorg/xserver/-/commit/b941a473e06f26a407a9adb15759be79f7418e86"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T16:13:50.592Z","slug":"CVE-2026-93520","body":"## Overview\n\nA heap buffer overflow caused by mismatching size calculations between XkbAllocNames and  ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.\n\n## Affected\n\n- `xorg-x11-server < 21.1.25`\n- `xwayland < 24.1.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}