What’s Vulnerable › Vulnerabilities

CVE-2026-93542: Out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes()

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-24
• Weakness: CWE-125

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.

Affected products

• x.org libXi: before 1.8.4 — fixed in 1.8.4

How to fix

Upgrade to a fixed version: x.org libXi 1.8.4. Check the vendor advisory for mitigations.

References

• https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=f499944ad595b9bd7e7571c810842244caf150aa

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