What is CVE-2026-93516?

CVE-2026-93516 is a medium-severity vulnerability in X.org Xorg-X11-Server, classified under Use After Free. CVSS score: 5.5/10. Published 2026-10-28.

How severe is CVE-2026-93516?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Use After Free in X.org Xorg-X11-Server

CVE-2026-93516

A use-after-free caused by lack of lifecycle management when adding / removing XInput master devices in X.org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X Clients to crash the X server or potentially execute code in X server context.

Vulnerability class: Use-After-Free

Published 2026-10-28 · last modified 2026-10-28.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-416 — Use After Free

References

gitlab.freedesktop.org/xorg/xserver/-/commit/be572634158850fff4e9829cee88db08d3… (patch)

Frequently asked questions

What is CVE-2026-93516?: CVE-2026-93516 is a medium-severity vulnerability in X.org Xorg-X11-Server, classified under Use After Free. CVSS score: 5.5/10. Published 2026-10-28.
How severe is CVE-2026-93516?: Medium severity. CVSS v3 base score is 5.5 out of 10.