Quick answers
- Is CVE-2026-94286 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-94286 being exploited in the wild.
- How severe is CVE-2026-94286?
- High severity, with a CVSS score of 7.1, published 28 September 2026.
- Which products and versions are affected?
- Freedesktop libXtst before 1.2.6.
- Is there a fix for CVE-2026-94286?
- A patch was published on 2026-09-23: Merge request merged on September 23, 2026 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-94286 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-94286?
- Check whether you run Freedesktop libXtst 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 RECORD reply parser in libXtst performs insufficient validation of the datum_bytes field claimed by a reply element against the actual reply buffer size. An attacker controlling a malicious X server can construct a RECORD reply where the declared element size exceeds the remaining buffer, resulting in an out-of-bounds read. The vulnerability requires an X client to connect to and trust the malicious server.
Affected products
- freedesktop libXtst before 1.2.6
Timeline
- 2026-09-28: disclosed
- 2026-09-23: patched: Merge request merged on September 23, 2026