CVE-2026-93542

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

CVE-2026-93542 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-93542, released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0026

18th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libXi · opensuse-leap 16.0	1.8.2-160000.4.1	OPENSUSE-SU-2026:22054-1	Nov 7, 2026
libXi · sles 16.0	1.8.2-160000.4.1	SUSE-SU-2026:24203-1	Nov 7, 2026
libxi · Debian 14	2:1.8.4-1	DEBIAN-CVE-2026-93542	Sep 24, 2026

Details

Published
September 24, 2026
Weakness
Out-of-bounds Read
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93542

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