Bug 2514992 (CVE-2026-73490) - CVE-2026-73490 loofah: Loofah: SVG `href` attribute bypasses local-reference restriction
Summary: CVE-2026-73490 loofah: Loofah: SVG `href` attribute bypasses local-reference ...
Keywords:
Status: NEW
Alias: CVE-2026-73490
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-12 21:01 UTC by OSIDB Bzimport
Modified: 2026-08-20 15:55 UTC (History)
23 users (show)

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Description OSIDB Bzimport 2026-08-12 21:01:46 UTC 
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.
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