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.
Published: 2026-11-06
Score: 6.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 06 Nov 2026 15:15:00 +0000

Type Values Removed Values Added
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.
Title Fluxbox through 1.3.7 Infinite Loop via Menu::updateMenu() Style Geometry
Weaknesses CWE-835
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-06T16:46:17.952Z

Reserved: 2026-11-06T14:37:46.448Z

Link: CVE-2026-123785

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-06T15:17:21.467

Modified: 2026-11-06T17:17:21.097

Link: CVE-2026-123785

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-06T16:45:05Z

Weaknesses
  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')