CVE-2026-94284 Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parser
A malicious X server can crash X clients via an out-of-bounds read in libX11's XIM trigger-key registration parser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-94284?
CVE-2026-94284 is a medium-severity memory corruption vulnerability in x.org libX11, published on 28 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
An out-of-bounds read vulnerability in libX11's XIM trigger-key registration parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.
Weakness: CWE-125
Which versions are affected by CVE-2026-94284?
How do I fix CVE-2026-94284?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-94284 being exploited?
There is no known exploitation of CVE-2026-94284 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-94284, AZL-104960, BELL-CVE-2026-94284, DEBIAN-CVE-2026-94284, ECHO-6fd9-a9ca-b441, GHSA-5j4r-gpq7-9www and 1 more.