Is CVE-2026-94283 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-94283 being exploited in the wild.

How severe is CVE-2026-94283?

Medium severity, with a CVSS score of 6.5, published 28 September 2026.

Is there a fix for CVE-2026-94283?

A patch was published on 2026-09-23: Merge request #310 with fixes merged upstream Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-94283 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-94283?

Check whether you run X.Org libX11 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-94283: libX11 out-of-bounds read in XIM attribute parser

CVE-2026-94283 · Severity: medium · CVSS 6.5 · Published 2026-09-28

libX11 is a core library that handles communication between X11 graphical applications and X servers. A malicious X server can exploit an out-of-bounds read vulnerability in the XIM (X Input Method) attribute parser to crash connected X client applications, potentially disrupting user sessions.

Technologies: X.Org libX11. Vendors: X.Org.

Quick answers

Is CVE-2026-94283 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-94283 being exploited in the wild.
How severe is CVE-2026-94283?: Medium severity, with a CVSS score of 6.5, published 28 September 2026.
Which products and versions are affected?: X.Org libX11 before 1.8.14.
Is there a fix for CVE-2026-94283?: A patch was published on 2026-09-23: Merge request #310 with fixes merged upstream Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-94283 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-94283?: Check whether you run X.Org libX11 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds read flaw exists in libX11's XIM attribute parser (imRmAttr.c and imDefIm.c) due to insufficient bounds checking when parsing XIM protocol messages from X servers. The vulnerability is reachable by any malicious X server without authentication. Exploitation results in a crash of the connected X client; a fix was merged into the upstream repository in September 2026.

Affected products

X.Org libX11 before 1.8.14

Timeline

2026-09-28: disclosed: CVE-2026-94283 published
2026-09-23: patched: Merge request #310 with fixes merged upstream

References

https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=42d0303f243002a9856c76060569a61893c670dd

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