All vulnerabilities
CVE-2026-93542

Out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes()

x.org libXi
Open in ThreatlineRecord JSON
CVSS
6.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.25%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.8.4Fixed versionCVE List
Published24 Sep 2026Updated 24 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before 1.8.4 could be used by malicous servers to crash the X client.

Text from CVE List

Affected versions 1

  • libXiaffected: all versions before 1.8.4CVE List

References 1