What is CVE-2026-94286?

CVE-2026-94286 is a high-severity vulnerability in X.org Libxtst, classified under Buffer Over-read. CVSS score: 7.1/10. Published 2026-09-28.

How severe is CVE-2026-94286?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in X.org Libxtst

CVE-2026-94286

An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.

Published 2026-09-28.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (7.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

X.org Libxtst

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/10/diffs (patch)

Frequently asked questions

What is CVE-2026-94286?: CVE-2026-94286 is a high-severity vulnerability in X.org Libxtst, classified under Buffer Over-read. CVSS score: 7.1/10. Published 2026-09-28.
How severe is CVE-2026-94286?: High severity. CVSS v3 base score is 7.1 out of 10.