🚨 [security] [ruby] Update loofah 2.25.0 → 2.25.1 (patch)

[depfu]

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

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Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

↗️ loofah (indirect, 2.25.0 → 2.25.1) · Repo · Changelog

Security Advisories 🚨

🚨 Improper detection of disallowed URIs by Loofah `allowed_uri?`

Summary

Loofah::HTML5::Scrub.allowed_uri? does not correctly reject javascript: URIs when the scheme is split by HTML entity-encoded control characters such as 
 (carriage return), 
 (line feed), or 	 (tab).

Details

The allowed_uri? method strips literal control characters before decoding HTML entities. Payloads like java
script:alert(1) survive the control character strip, then 
 is decoded to a carriage return, producing java\rscript:alert(1).

Note that the Loofah sanitizer's default sanitize() path is not affected because Nokogiri decodes HTML entities during parsing before Loofah evaluates the URI protocol. This issue only affects direct callers of the allowed_uri? string-level helper when passing HTML-encoded strings.

Impact

Applications that call Loofah::HTML5::Scrub.allowed_uri? to validate user-controlled URLs and then render approved URLs into href or other browser-interpreted URI attributes may be vulnerable to cross-site scripting (XSS).

This only affects Loofah 2.25.0.

Mitigation

Upgrade to Loofah >= 2.25.1.

Credit

Responsibly reported by HackOne user @smlee.

Release Notes

2.25.1

2.25.1 / 2026-03-17

• Ensure Loofah::HTML5::Scrub.allowed_uri? recognizes unescaped whitespace entities and rejects schemas containing them. See GHSA-46fp-8f5p-pf2m. #302 @flavorjones

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 4 commits:

• version bump to v2.25.1
• Merge pull request #302 from flavorjones/flavorjones/better-allowed-uri
• Update `allowed_uri?` to handle unescaped whitespace entities
• doc: Move security reporting to Github

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.93%. Comparing base (7eb0768) to head (2136fcc).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2749   +/-   ##
========================================
  Coverage    84.93%   84.93%           
========================================
  Files          501      501           
  Lines        20600    20600           
  Branches       377      377           
========================================
  Hits         17497    17497           
  Misses        3100     3100           
  Partials         3        3           

Flag	Coverage Δ
javascript	80.25% <ø> (ø)
pull_request	84.93% <ø> (ø)
push	84.93% <ø> (ø)
ruby	92.54% <ø> (ø)

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