{"id":"CVE-2026-73491","title":"Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri","summary":"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 …","severity":"low","cvss":2.3,"cvssVector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","cwe":["CWE-184"],"vendor":"flavorjones","product":"loofah","affected":["loofah >= 2.25.0, < 2.25.2"],"published":"2026-08-12","updated":"2026-09-09","sourceUpdated":"2026-09-09T20:58:37.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73491","references":[{"url":"https://github.com/flavorjones/loofah/commit/5e91af861e3cdab47b91dd0b81f3afdfd13a5e19","label":"security-advisories@github.com"},{"url":"https://github.com/flavorjones/loofah/pull/308","label":"security-advisories@github.com"},{"url":"https://github.com/flavorjones/loofah/releases/tag/v2.25.2","label":"security-advisories@github.com"},{"url":"https://github.com/flavorjones/loofah/security/advisories/GHSA-8whx-365g-h9vv","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-13T13:49:09.263231Z"},"cvssSource":"cna","ingestedAt":"2026-09-13T09:27:34.986Z","epss":0.00394,"epssPercentile":0.30817,"slug":"CVE-2026-73491","body":"## Overview\n\nLoofah 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":13,"depthScoreParts":{"impact":12.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}