{"id":"CVE-2026-73490","aliases":["GHSA-9wjq-cp2p-hrgf"],"url":"https://o3.security/vulnerability/CVE-2026-73490","summary":"Loofah: SVG `href` attribute bypasses local-reference restriction","details":"Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.2, Loofah's HTML5 sanitizer applies its local-reference restriction only to the xlink:href attribute on SVG use and feImage elements, while browsers also accept the plain href attribute. A crafted sanitized SVG can therefore reference an arbitrary same-origin external document; use may render external SVG content containing scripts or other dangerous content, and feImage may load external images for tracking. Applications that sanitize user-supplied SVG with Loofah's default allowlist are affected. This issue is fixed in version 2.25.2.","published":"2026-08-12T20:58:12.219Z","modified":"2026-08-15T11:31:28.643950021Z","cvss":{"score":4.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"RubyGems","name":"loofah","fixedVersion":"2.25.2"}],"fix":{"url":"https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9","label":"flavorjones/loofah@20867b9"},"references":[{"type":"WEB","url":"https://github.com/flavorjones/loofah/releases/tag/v2.25.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73490.json"},{"type":"ADVISORY","url":"https://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73490"},{"type":"FIX","url":"https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9"},{"type":"FIX","url":"https://github.com/flavorjones/loofah/pull/308"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-15T11:31:28.643950021Z"}}