What is CVE-2026-88812?

CVE-2026-88812 is a high-severity vulnerability in X.org Xorg-X11-Server, classified under Double Free. CVSS score: 7.8/10. Published 2026-10-27.

How severe is CVE-2026-88812?

High severity. CVSS v3 base score is 7.8 out of 10.

Double Free in X.org Xorg-X11-Server

CVE-2026-88812

A double free in XKB SetGeometryin X.Org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by attached clients to cause a crash or potentially code in the x server context.

Vulnerability class: Double Free

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-415 — Double Free

References

gitlab.freedesktop.org/xorg/xserver/-/commit/0d1b1b0bad86c9ea2a3b7ca5a70e681dc6… (patch)

Frequently asked questions

What is CVE-2026-88812?: CVE-2026-88812 is a high-severity vulnerability in X.org Xorg-X11-Server, classified under Double Free. CVSS score: 7.8/10. Published 2026-10-27.
How severe is CVE-2026-88812?: High severity. CVSS v3 base score is 7.8 out of 10.