Medium [CVE-2026-73490] SVG `href` attribute bypasses local-reference restriction
This medium-severity Red Hat Linux advisory covers CVE-2026-73490 affecting Red Hat 3scale API Management Platform 2, Red Hat Satellite 6.
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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 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.
This could lead to information disclosure through external image loading for tracking or potentially script execution by rendering external SVG content containing malicious scripts. Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N).
Weakness: CWE-184. Affected Red Hat products: Red Hat 3scale API Management Platform 2; Red Hat Satellite 6.
Red Hat does not currently list a fixing RHSA for this CVE.
- < 2.25.2
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
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