Vulnerability 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: 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.
Related Weaknesses (CWE)
References
- https://github.com/flavorjones/loofah/commit/f1be9d893b5a8dd79240441a912d8897e74
- https://github.com/flavorjones/loofah/pull/308
- https://github.com/flavorjones/loofah/releases/tag/v2.25.2
- https://github.com/flavorjones/loofah/security/advisories/GHSA-5qhf-9phg-95m2
FAQ
What is CVE-2026-73492?
CVE-2026-73492 is a documented vulnerability. 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 ja...
How severe is CVE-2026-73492?
CVSS scoring is not yet available for CVE-2026-73492. Check NVD for updates.
Is there a patch for CVE-2026-73492?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.