Ruby CVE-2026-25500
MEDIUM
GHSA-whrj-4476-wvmp
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
4DescriptionNVD
Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, Rack::Directory generates an HTML directory index where each file entry is rendered as a clickable link. If a file exists on disk whose basename starts with the javascript: scheme (e.g. javascript:alert(1)), the generated index contains an anchor whose href is exactly javascript:alert(1). Clicking the entry executes JavaScript in the browser (demonstrated with alert(1)). Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.
AnalysisAI
Rack's Directory module fails to sanitize filenames when generating HTML directory listings, allowing attackers to craft files with javascript: scheme names that execute arbitrary code when clicked. Authenticated users or those with access to directories containing maliciously named files can trigger stored XSS attacks affecting other users viewing the directory index. …
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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