CVE-2026-94285 Out-of-bounds read in libX11's byte-oriented codeset parser
A malicious X server can crash X clients via an out-of-bounds read in the libX11 codeset parser, affecting systems using this library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-94285?
CVE-2026-94285 is a medium-severity denial of service vulnerability in x.org libX11, published on 28 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An out-of-bounds read in libX11's byte-oriented codeset 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-2026-94285?
How do I fix CVE-2026-94285?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-94285 being exploited?
There is no known exploitation of CVE-2026-94285 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-94285, AZL-104957, BELL-CVE-2026-94285, DEBIAN-CVE-2026-94285, ECHO-c376-ea09-ef71, GHSA-f73h-qw9f-3h88 and 1 more.