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  4. CVE 2026 109088 libxtst record enablecontext reply endless loop
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-109088

libXtst RECORD EnableContext Reply Endless LoopCVE-2026-109088

Answer in brief

CVE-2026-109088 records a Medium severity (CVSS 6.5) vulnerability in libXtst RECORD EnableContext Reply Endless Loop. The current sources do not mark it as known exploited. The current feed maps X.org/libXtst (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 Oct 27, 2026Updated Oct 27, 2026Source checked Oct 27, 2026First seen by HOL Oct 27, 2026Material review Oct 27, 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/libXtst (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
X.org/libXtstgeneric>=0 <1.2.61.2.6

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for X.org/libXtst.
  2. 2Review the reported fix. Update X.org/libXtst to 1.2.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 27, 2026

Sources and claim methodology

  • Source referencegitlab.freedesktop.org
Upstream source description

A malicious X server could send malformed  RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-835
Source
CVE List V5
Source checked
Oct 27, 2026
References
1 linked source
Open source record