Quick answers
- Is CVE-2026-93542 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93542 being exploited in the wild.
- How severe is CVE-2026-93542?
- 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-2026-93542?
- A patch was published on 2026-09-23: Fix merged in GitLab merge request !23 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-93542 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-93542?
- 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 the size_classes() and copy_classes() functions when parsing XI2 device class information, triggered via improper bounds checking of class header data. The vulnerability is triggered by network input from an X server without proper validation of message boundaries. A malicious X server can craft a specially formatted reply to trigger the out-of-bounds read, causing a crash of the client application.
Affected products
- X.Org libXi before 1.8.4
Timeline
- 2026-09-24: disclosed
- 2026-09-23: patched: Fix merged in GitLab merge request !23