# CVE-2026-94282: libXi out-of-bounds read in XI2 enter/leave/focus event parsing

Source: https://junglewise.ai/threats/cve-2026-94282-an-out-of-bounds-read-in-libxi-s-xi2-enter-leave-focus-cookie  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-94282 · Severity: medium · CVSS 5.6 · Published 2026-09-28

libXi is a library that X11 client applications use to communicate with the X server for input device handling. A malicious X server can craft specially formatted enter/leave/focus events that cause an out-of-bounds memory read in the client library, crashing any X client that receives them. This could be exploited to deny service to X applications.

Vendors: [Freedesktop](https://junglewise.ai/threats/vendors/freedesktop).

## Quick answers

**Is CVE-2026-94282 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-94282 being exploited in the wild.

**How severe is CVE-2026-94282?** Medium severity, with a CVSS score of 5.6, published 28 September 2026.

**Which products and versions are affected?** Freedesktop libXi before 1.8.4.

**Is there a fix for CVE-2026-94282?** 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-2026-94282 attacked?** It is in a software library.

**Am I affected by CVE-2026-94282?** Check whether you run Freedesktop 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

The vulnerability is an out-of-bounds read in the wireToEnterLeave() function during XI2 event conversion. The function processes enter/leave/focus cookie events without properly validating that the buttons_len field does not exceed the available event data, leading to reads beyond allocated buffers. A malicious X server can trigger this by sending a crafted xXIEnterEvent with an inflated buttons_len value, causing the client to crash or potentially disclose memory.

## Affected products

- freedesktop libXi before 1.8.4

## Timeline

- 2026-09-28: disclosed

## References

- [https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=cecf160e9731fe01f3632f875f29ffcb598b052a](https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=cecf160e9731fe01f3632f875f29ffcb598b052a)