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

Source: https://junglewise.ai/threats/cve-2026-94281-an-out-of-bounds-read-in-libxi-s-xlistinputdevices-class-parsing  
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-2026-94281 · 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](https://junglewise.ai/threats/technologies/libxi). Vendors: [X.Org](https://junglewise.ai/threats/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

- [https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=605f419d013153bf9e026cd100752ffbe930f3c1](https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=605f419d013153bf9e026cd100752ffbe930f3c1)

## Related threats

- [libXi heap overflow in DEVICE_ENABLE reply handling](https://junglewise.ai/threats/cve-2026-109090-a-malicious-x-server-could-cause-a-heap-overflow-by-injecting-a)
- [libXi heap buffer overflow in DEVICE_RESOLUTION handling](https://junglewise.ai/threats/cve-2026-109089-a-buffer-overflow-when-handling-device-resolution-in-libxi)
- [libXi out-of-bounds read in XI2 XIQueryDevice reply parsing](https://junglewise.ai/threats/cve-2026-93544-an-out-of-bounds-read-in-libxi-s-xi2-xiquerydevice-reply-parsing)
- [libXi out-of-bounds read in XI2 class parser](https://junglewise.ai/threats/cve-2026-93543-an-out-of-bounds-read-in-libxi-s-xi2-class-parser-in-libxi-before)
- [libXi out-of-bounds read in XI2 class parsing](https://junglewise.ai/threats/cve-2026-93542-an-out-of-bounds-read-in-libxi-s-xi2-class-parsing-via-size)