CVE-2026-73490

MEDIUM 4.7

Loofah: SVG `href` attribute bypasses local-reference restriction

CVSS Score

4.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	flavorjones
Product	loofah
Published	Aug 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

flavorjones / loofah

< 2.25.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf github.com: https://github.com/flavorjones/loofah/pull/308 github.com: https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9 github.com: https://github.com/flavorjones/loofah/releases/tag/v2.25.2