Out-of-bounds Read in X.org Libxi

CVE-2026-93543

An out-of-bounds read in libXi's XI2 class parser in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.

Vulnerability class: Buffer Overflow

Published 2026-09-24 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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

X.org Libxi

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs (patch)

Frequently asked questions

What is CVE-2026-93543?: CVE-2026-93543 is a high-severity vulnerability in X.org Libxi, classified under Out-of-bounds Read. CVSS score: 7.4/10. Published 2026-09-24.
How severe is CVE-2026-93543?: High severity. CVSS v3 base score is 7.4 out of 10.