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

Medium · CVSS 6.5CVE-2026-93542

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

Answer in brief

CVE-2026-93542 records a Medium severity (CVSS 6.5) vulnerability in Out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes(). The current sources do not mark it as known exploited. The current feed maps x.org/libXi (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps x.org/libXi (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
x.org/libXigeneric	>=0 <1.8.4	1.8.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for x.org/libXi.
Review the reported fix. Update x.org/libXi to 1.8.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Source referencegitlab.freedesktop.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.