# CVE-2026-93545: libXi out-of-bounds read in XListInputDevices()

Source: https://junglewise.ai/threats/cve-2026-93545-an-out-of-bounds-read-in-libxi-s-xlistinputdevices-in-libxi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-93545 · Severity: medium · CVSS 6.5 · Published 2026-09-24

libXi is a library that allows X client applications to communicate with the X server about input devices. A malicious or compromised X server can exploit an out-of-bounds read vulnerability in the XListInputDevices() function to crash an X client application. This could be used to cause denial of service or as part of a broader attack against systems using X11.

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

## Quick answers

**Is CVE-2026-93545 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93545 being exploited in the wild.

**How severe is CVE-2026-93545?** Medium severity, with a CVSS score of 6.5, published 24 September 2026.

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

**Is there a fix for CVE-2026-93545?** 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-2026-93545 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-93545?** Check whether you run Freedesktop.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

The vulnerability is an out-of-bounds read in libXi's XListInputDevices() function that occurs when parsing device names from the X server response. The vulnerable code does not properly validate buffer boundaries before reading name length values and copying device names, allowing a malicious X server to trigger memory access beyond allocated buffers. The fix adds explicit end-of-buffer checks before each memory access operation.

## Affected products

- freedesktop.org libXi before 1.8.4

## Timeline

- 2026-09-24: disclosed

## References

- [https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=234ce17d95c42d75f7f7fdb2bf7a24875451bc0a](https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=234ce17d95c42d75f7f7fdb2bf7a24875451bc0a)