Bug 2520932

Summary: CVE-2026-73490 rubygem-loofah: Loofah: SVG `href` attribute bypasses local-reference restriction [fedora-all]
Product: [Fedora] Fedora Reporter: Michalis Papadopoullos <mpapadop>
Component: rubygem-loofahAssignee: Vít Ondruch <vondruch>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: rawhideCC: ktdreyer, ruby-packagers-sig, vondruch
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["ef567479-b110-4124-b0e3-e73972e61897"]}
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Description Michalis Papadopoullos 2026-08-21 10:00:21 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.