CVE-2026-73491

Description

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: URIs whose scheme is split or prefixed with the HTML5 named whitespace character references 	 or 
. CGI.unescapeHTML leaves those references intact, so allowed_uri? reports the URL safe even though a browser decodes and strips the tab or line feed and executes the resulting javascript: URL. 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.

References

https://github.com/flavorjones/loofah/security/advisories/GHSA-8whx-365g-h9vv

https://github.com/flavorjones/loofah/releases/tag/v2.25.2

https://github.com/flavorjones/loofah/pull/308

https://github.com/flavorjones/loofah/commit/5e91af861e3cdab47b91dd0b81f3afdfd13a5e19

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4