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Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M

CVE-2026-73490Loofah: SVG `href` attribute bypasses local-reference restriction

Medium 4.7

In plain English

A medium-severity cross-site scripting in loofah from flavorjones. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.3%top 77.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12ruby-loofahno fix listedDEBIAN-CVE-2026-73490
Debian:13ruby-loofahno fix listedDEBIAN-CVE-2026-73490
Debian:14ruby-loofah2.25.2-1DEBIAN-CVE-2026-73490
RubyGemsloofah2.25.2GHSA-9wjq-cp2p-hrgf
Ubuntu:22.04:LTSruby-loofahno fix listedUBUNTU-CVE-2026-73490
Ubuntu:24.04:LTSruby-loofahno fix listedUBUNTU-CVE-2026-73490
Ubuntu:26.04:LTSruby-loofahno fix listedUBUNTU-CVE-2026-73490
Ubuntu:26.10ruby-loofahno fix listedUBUNTU-CVE-2026-73490

Affected products (as reported)

VendorProductVersions
flavorjones loofah < 2.25.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

References