# CVE-2026-93520: X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write

Status: published. Published: 2026-10-28. Updated: 2026-11-07.

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 execute code in X server context.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: suse) — https://gitlab.freedesktop.org/xorg/xserver/-/commit/b941a473e06f26a407a9adb15759be79f7418e86

## Affected products and versions

- x.org / xorg-x11-server (xorg-x11-server): ≥ 0; < 21.1.25 (affected, rpm). Source: CNA: suse
- x.org / xwayland (xwayland): ≥ 0; < 24.1.14 (affected, rpm). Source: CNA: suse

## Severity and prioritization

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: suse

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: meissner@suse.de

- CISA KEV: No listing in collected sources

- EPSS: 0.20% as of 2026-11-06; percentile 10.21%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-122

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://gitlab.freedesktop.org/xorg/xserver/-/commit/b941a473e06f26a407a9adb15759be79f7418e86 (CNA: suse; patch)

- https://gitlab.freedesktop.org/xorg/xserver/-/commit/b941a473e06f26a407a9adb15759be79f7418e86 (meissner@suse.de)

## Provenance

- CNA: suse: https://www.cve.org/CVERecord?id=CVE-2026-93520; retrieved 2026-11-07; source updated 2026-11-07

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93520; retrieved 2026-11-07; source updated 2026-11-07

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-93520; retrieved 2026-11-06; source updated Not reported

Revision: 516bd2d0f4414dcae4abc129db0a5d4f8c4d4d892a1a5687d9400b2f8db6dde4

Canonical: https://y2.dev/cve/CVE-2026-93520

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