What is CVE-2026-93536?

CVE-2026-93536 is a medium-severity vulnerability in X.org Xorg-X11-Server, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2026-10-28.

How severe is CVE-2026-93536?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in X.org Xorg-X11-Server

CVE-2026-93536

A use after free caused by missing lifecycle management of gesture sprites in GestureBuildSprite() 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.

Vulnerability class: Buffer Overflow

Published 2026-10-28.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/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-122 — Heap-based Buffer Overflow

References

gitlab.freedesktop.org/xorg/xserver/-/commit/efcfd8acc754c5ac4b2555ff375dd5101d… (patch)

Frequently asked questions

What is CVE-2026-93536?: CVE-2026-93536 is a medium-severity vulnerability in X.org Xorg-X11-Server, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2026-10-28.
How severe is CVE-2026-93536?: Medium severity. CVSS v3 base score is 5.3 out of 10.