Quick answers
- Is CVE-2026-93543 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93543 being exploited in the wild.
- How severe is CVE-2026-93543?
- High severity, with a CVSS score of 7.4, published 24 September 2026.
- Which products and versions are affected?
- X.Org libXi before 1.8.4.
- Is there a fix for CVE-2026-93543?
- A patch was published on 2026-09-23. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-93543 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-93543?
- 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
The vulnerability is an out-of-bounds read in the XI2 class parser within libXi before version 1.8.4, occurring during parsing of class records in X server replies. The flaw is triggered when a malicious X server sends crafted XIQueryDevice or similar XI2 protocol messages with invalid class payloads, allowing the server to read memory beyond buffer boundaries. The fix adds proper payload validation via a validate_class_payload() function to ensure declared wire lengths match actual data requirements.
Affected products
- X.Org libXi before 1.8.4
Timeline
- 2026-09-24: disclosed
- 2026-09-23: patched