What is CVE-2026-109089?

CVE-2026-109089 is a high-severity vulnerability in X.org Libxi, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-10-27.

How severe is CVE-2026-109089?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in X.org Libxi

CVE-2026-109089

A buffer overflow when handling DEVICE_RESOLUTION in libXi before 1.8.4 could overflow a heap, triggered by a malicious X server.

Vulnerability class: Buffer Overflow

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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

X.org Libxi

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

gitlab.freedesktop.org/xorg/lib/libxi/-/commit/f7836d0a0 (patch)

Frequently asked questions

What is CVE-2026-109089?: CVE-2026-109089 is a high-severity vulnerability in X.org Libxi, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-10-27.
How severe is CVE-2026-109089?: High severity. CVSS v3 base score is 7.5 out of 10.