CVE-2026-73491

Name	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 &Tab; or &NewLine;. 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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ruby-loofah (PTS)	bullseye	2.7.0+dfsg-1	vulnerable
	bullseye (security)	2.7.0+dfsg-1+deb11u1	vulnerable
	bookworm	2.19.1-1	vulnerable
	trixie	2.24.0-1	vulnerable
	forky	2.25.1-2	vulnerable
	sid	2.25.2-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ruby-loofah	source	(unstable)	2.25.2-1

Notes

[trixie] - ruby-loofah <no-dsa> (Minor issue)
https://github.com/flavorjones/loofah/security/advisories/GHSA-8whx-365g-h9vv
https://github.com/flavorjones/loofah/pull/308
Fixed by: https://github.com/flavorjones/loofah/commit/5e91af861e3cdab47b91dd0b81f3afdfd13a5e19 (v2.25.2)