{"id":"UBUNTU-CVE-2026-73492","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 &#58, &#9, &#10, or &#13. 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.","modified":"2026-08-19T11:11:14Z","published":"2026-08-12T22:17:00Z","upstream":["CVE-2026-73492"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-73492"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-73492"},{"type":"REPORT","url":"https://github.com/flavorjones/loofah/security/advisories/GHSA-5qhf-9phg-95m2"},{"type":"REPORT","url":"https://github.com/flavorjones/loofah/pull/308"},{"type":"REPORT","url":"https://github.com/flavorjones/loofah/commit/f1be9d893b5a8dd79240441a912d8897e74c38c0"},{"type":"REPORT","url":"https://github.com/flavorjones/loofah/releases/tag/v2.25.2"}],"affected":[{"package":{"name":"ruby-loofah","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-loofah?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.2-1","2.0.3-1","2.0.3-2","2.0.3-2+deb9u1build0.16.04.1","2.0.3-2+deb9u2build0.16.04.1","2.0.3-2+deb9u3build0.16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-loofah","binary_version":"2.0.3-2+deb9u3build0.16.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73492.json"}},{"package":{"name":"ruby-loofah","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-loofah?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.3-2","2.2.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-loofah","binary_version":"2.2.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73492.json"}},{"package":{"name":"ruby-loofah","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-loofah?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.3-1","2.3.1+dfsg-1","2.4.0+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-loofah","binary_version":"2.4.0+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73492.json"}},{"package":{"name":"ruby-loofah","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ruby-loofah?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.0-1","2.13.0-1","2.13.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-loofah","binary_version":"2.13.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73492.json"}},{"package":{"name":"ruby-loofah","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ruby-loofah?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.21.3-1","2.21.4-1","2.22.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-loofah","binary_version":"2.22.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73492.json"}},{"package":{"name":"ruby-loofah","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/ruby-loofah?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.24.1-1","2.25.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.25.0-1","binary_name":"ruby-loofah"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73492.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}