CVE-2026-94281: libXi out-of-bounds read in XListInputDevices() class parsing

CVE-2026-94281 · Severity: medium · CVSS 6.5 · Published 2026-09-24

libXi is a library that allows X11 client applications to interact with input devices. A malicious X server can trigger an out-of-bounds memory read in the XListInputDevices() function, causing an X client to crash. This could be exploited to launch denial-of-service attacks against graphical applications.

Technologies: X.Org libXi. Vendors: X.Org.

Quick answers

Is CVE-2026-94281 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-94281 being exploited in the wild.
How severe is CVE-2026-94281?
Medium severity, with a CVSS score of 6.5, published 24 September 2026.
Which products and versions are affected?
X.Org libXi before 1.8.4.
Is there a fix for CVE-2026-94281?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-94281 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-94281?
Check whether you run X.Org libXi 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 libXi's XListInputDevices() function during class parsing. The ParseClassInfo() function fails to properly validate buffer boundaries when parsing class information structures received from the X server, allowing a malicious server to read memory beyond allocated buffers. The vulnerability requires a network connection to a malicious X server and can be exploited without authentication.

Affected products

  • X.Org libXi before 1.8.4

Timeline

  • 2026-09-24: disclosed

References

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