--- id: CVE-2026-73490 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. Prior to 2.25.2, Loofah's HTML5 sanitizer applies its local-reference restriction only to the xlink:href attribute … severity: medium cvss: 4.7 cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N' cwe: - CWE-79 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-2026-73490' references: - url: >- https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9 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-9wjq-cp2p-hrgf label: security-advisories@github.com tags: - nvd epss: 0.00296 epssPercentile: 0.19828 ingestedAt: '2026-09-09T21:22:45.532Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges.