CVE-2026-73490

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

Published: Aug 12, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-79

4.7MEDIUM

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

flavorjones

oss-projectaka loofah

loofahLibrary

OSS Libraries / rubygems

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9

github.com

https://github.com/flavorjones/loofah/pull/308

github.com

https://github.com/flavorjones/loofah/releases/tag/v2.25.2

github.com

and 1 more references View all →

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