Is CVE-2026-94284 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-94284 being exploited in the wild.

How severe is CVE-2026-94284?

Medium severity, with a CVSS score of 5.5, published 28 September 2026.

Is there a fix for CVE-2026-94284?

A patch was published on 2026-09-23. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-94284 attacked?

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

Am I affected by CVE-2026-94284?

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-2026-94284: libX11 out-of-bounds read in XIM trigger-key registration parser

CVE-2026-94284 · Severity: medium · CVSS 5.5 · Published 2026-09-28

libX11 is a core library that handles communication between X client applications and X servers on Unix-like systems. A malicious X server can trigger an out-of-bounds memory read in the trigger-key registration parser, causing X client applications to crash and resulting in denial of service.

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

Quick answers

Is CVE-2026-94284 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-94284 being exploited in the wild.
How severe is CVE-2026-94284?: Medium severity, with a CVSS score of 5.5, published 28 September 2026.
Which products and versions are affected?: X.Org libX11 before 1.8.14.
Is there a fix for CVE-2026-94284?: A patch was published on 2026-09-23. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-94284 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-94284?: 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 vulnerability exists in the _XimRegisterTriggerkey() function in libX11's XIM (X Input Method) implementation when parsing trigger-key registration messages. The vulnerability stems from insufficient bounds checking on untrusted data received from X servers. An attacker controlling an X server can send a crafted message to crash connected X clients.

Affected products

X.Org libX11 before 1.8.14

Timeline

2026-09-28: disclosed
2026-09-23: patched

References

https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=1b7904002d212eed40949ccf4e8e7156f9fec0e2

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