CVE-2026-73490: medium-severity vulnerability in flavorjones loofah
Loofah: SVG `href` attribute bypasses local-reference restriction
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.7epss 0.3%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
flavorjones · loofahRelated CVEs — flavorjones loofah
In the same product, most dangerous first.
CVE-2022-23514HIGHInefficient Regular Expression Complexity in LoofahEPSS 1.8%CVE-2022-23516HIGHUncontrolled Recursion in LoofahEPSS 1.2%CVE-2022-23515MEDIUMImproper neutralization of data URIs may allow XSS in LoofahEPSS 0.9%CVE-2026-73492LOWLoofah `allowed_uri?` does not detect `javascript:` URIs split by numeric character references without semicolonsEPSS 0.4%CVE-2026-73491LOWLoofah `allowed_uri?` does not detect `javascript:` URIs split by named whitespace character referencesEPSS 0.4%