CVE-2026-73492 (Medium) detected in loofah-2.25.1.gem

Nobody has claimed this yet.

## CVE-2026-73492 - Medium Severity Vulnerability
Vulnerable Library - loofah-2.25.1.gem

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments,
built on top of Nokogiri.

Loofah also includes some HTML sanitizers based on `html5lib`'s safelist, which are a specific
application of the general transformation functionality.

Library home page: https://rubygems.org/gems/loofah-2.25.1.gem

Sample Path to Dependency File: /Gemfile.lock

Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/loofah-2.25.1.gem

Dependency Hierarchy:
- rails-8.0.5.gem (Root Library)
- activestorage-8.0.5.gem
- actionpack-8.0.5.gem
- actionview-8.0.5.gem
- rails-html-sanitizer-1.7.0.gem
- :x: **loofah-2.25.1.gem** (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.2, Loofah::HTML5::Scrub.allowed_uri? does not reject javascript: or vbscript: URIs whose scheme is split by semicolon-less numeric character references such as :, ,
, or
. CGI.unescapeHTML leaves these references encoded, so allowed_uri? reports the URL safe even though a browser decodes an encoded colon or strips encoded whitespace and executes the resulting URI scheme. This issue affects only callers that pass HTML-encoded strings directly to allowed_uri?; Loofah's default sanitize() path is not affected. This issue is fixed in version 2.25.2.

Publish Date: 2026-08-12

URL: CVE-2026-73492

CVSS 3 Score Details (4.9)

Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: High
- Privileges Required: Low
- User Interaction: None
- Scope: Changed
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/flavorjones/loofah/security/advisories/GHSA-5qhf-9phg-95m2

Release Date: 2026-08-12

Fix Resolution: loofah - 2.25.2,https://github.com/flavorjones/loofah.git - v2.25.2

***
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Start with Gemfile.lock and the listed Rails dependency chain to see how loofah-2.25.1 is resolved. Update the dependency to loofah 2.25.2, then confirm the lockfile no longer resolves the vulnerable version and the reported vulnerability is addressed.

Written by the indexing model from the issue text.