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Back to active CVEs
High · CVSS 8.5CVE-2026-93517

X.Org Server GLX RenderLarge Heap Buffer OverflowCVE-2026-93517

Answer in brief

CVE-2026-93517 records a High severity (CVSS 8.5) vulnerability in X.Org Server GLX RenderLarge Heap Buffer Overflow. The current sources do not mark it as known exploited. The current feed maps x.orgg/xorg-x11-server (generic), x.org/xwayland (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 28, 2026Updated Oct 28, 2026Source checked Oct 28, 2026First seen by HOL Oct 28, 2026Material review Oct 28, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.5. 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.orgg/xorg-x11-server (generic), x.org/xwayland (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
x.orgg/xorg-x11-servergeneric>=0 <21.1.2521.1.25
x.org/xwaylandgeneric>=0 <24.1.1424.1.14

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for x.orgg/xorg-x11-server, x.org/xwayland.
  2. 2Review the reported fix. Update x.orgg/xorg-x11-server to 21.1.25; x.org/xwayland to 24.1.14 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 28, 2026

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

  2. Source modified

    Oct 28, 2026

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

  3. First seen by HOL

    Oct 28, 2026

Sources and claim methodology

  • Source referencegitlab.freedesktop.org
Upstream source description

A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server context.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • .Org Server Present Extension Use-After-FreeSame x.org/xwayland package
  • .Org Server XInput Passive Grab Use-After-FreeSame x.org/xwayland package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-122
Source
CVE List V5
Source checked
Oct 28, 2026
References
1 linked source
Open source record