CVE-2026-73490

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{"affected": [{"affectedData": [{"product": "loofah", "vendor": "flavorjones", "versions": [{"status": "affected", "version": "< 2.25.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Loofah es una biblioteca general para manipular y transformar documentos y fragmentos HTML/XML, construida sobre Nokogiri. Antes de la versi\u00f3n 2.25.2, el saneador HTML5 de Loofah aplica su restricci\u00f3n de referencia local solo al atributo xlink:href en los elementos SVG use y feImage, mientras que los navegadores tambi\u00e9n aceptan el atributo href simple. Un SVG saneado y elaborado puede, por lo tanto, hacer referencia a un documento externo de mismo origen arbitrario; use puede renderizar contenido SVG externo que contenga scripts u otro contenido peligroso, y feImage puede cargar im\u00e1genes externas para seguimiento. Las aplicaciones que sanean SVG proporcionado por el usuario con la lista de permitidos predeterminada de Loofah se ven afectadas. Este problema est\u00e1 solucionado en la versi\u00f3n 2.25.2."}], "id": "CVE-2026-73490", "lastModified": "2026-10-24T15:10:00.190", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-73490", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-13T13:01:37.604672Z", "version": "2.0.3"}}]}, "published": "2026-08-12T21:17:42.127", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9"}, {"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/pull/308"}, {"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/releases/tag/v2.25.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "loofah: Loofah: SVG `href` attribute bypasses local-reference restriction", "id": "2514992", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514992"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-184", "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.", "A flaw was found in Loofah. The HTML5 sanitizer incorrectly 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 remote attacker could exploit this by crafting a sanitized SVG that references an arbitrary same-origin external document. This could lead to information disclosure through external image loading for tracking or potentially script execution by rendering external SVG content containing malicious scripts."], "name": "CVE-2026-73490", "public_date": "2026-08-12T20:58:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-73490\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-73490\nhttps://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9\nhttps://github.com/flavorjones/loofah/pull/308\nhttps://github.com/flavorjones/loofah/releases/tag/v2.25.2\nhttps://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf"], "threat_severity": "Moderate"}

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