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Back to active CVEs
Medium · CVSS 6.8CVE-2026-123785

Fluxbox through 1.3.7 Infinite Loop via Menu::updateMenu() Style GeometryCVE-2026-123785

Answer in brief

CVE-2026-123785 records a Medium severity (CVSS 6.8) vulnerability in Fluxbox through 1.3.7 Infinite Loop via Menu::updateMenu() Style Geometry. The current sources do not mark it as known exploited. The current feed maps fluxbox/fluxbox (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 Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.8. 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 fluxbox/fluxbox (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
fluxbox/fluxboxgeneric>=0 <=1.3.7Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for fluxbox/fluxbox.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

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

  2. Source modified

    Nov 6, 2026

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

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Fluxbox through 1.3.7 contains an infinite loop vulnerability in Menu::updateMenu() in src/FbTk/Menu.cc that allows attackers to hang the window manager via crafted style geometry values. Attackers can supply a style with an oversized unbounded menu.titleHeight so the column loop never terminates, causing sustained CPU use and denial of service at startup.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Fluxbox through 1.3.7 OS Command Injection via Style Background ValuesSame fluxbox/fluxbox package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-835
Source
CVE List V5
Source checked
Nov 6, 2026
References
4 linked sources
Open source record