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Ruby CVE-2026-25500

MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-02-18 security-advisories@github.com GHSA-whrj-4476-wvmp
5.4
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
SUSE
MEDIUM
qualitative
Red Hat
5.4 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 19, 2026 - 18:26 vuln.today
Public exploit code
Patch released
Feb 19, 2026 - 18:26 nvd
Patch available
CVE Published
Feb 18, 2026 - 20:18 nvd
MEDIUM 5.4

DescriptionGitHub Advisory

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. Public exploit code exists for versions prior to 2.2.22, 3.1.20, and 3.2.5.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Rack. 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,

RemediationAI

A vendor patch is available — apply it immediately. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 16.0 Fixed
SUSE Linux Enterprise High Availability Extension 16.1 Fixed

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CVE-2026-25500 vulnerability details – vuln.today

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