# CVE-2026-73491: ruby-loofah: Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri

CVE-2026-73491 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-73491, released August 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-73491
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0039
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 12, 2026

## Description

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.2, Loofah::HTML5::Scrub.allowed_uri? does not reject javascript: URIs whose scheme is split or prefixed with the HTML5 named whitespace character references 	 or 
. CGI.unescapeHTML leaves those references intact, so allowed_uri? reports the URL safe even though a browser decodes and strips the tab or line feed and executes the resulting javascript: URL. This issue affects only callers that pass HTML-encoded strings directly to allowed_uri?; Loofah's default sanitize() path is not affected. This issue is fixed in version 2.25.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | hawk2 opensuse-leap 16.0 | 2.7.2+git.1788518533.7d4dadd6-160000.1.1 | [OPENSUSE-SU-2026:22068-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22068-1.md) | Nov 7, 2026 |
| Linux | hawk2 sles 16.0 | 2.7.2+git.1788518533.7d4dadd6-160000.1.1 | [SUSE-SU-2026:24195-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24195-1.md) | Nov 7, 2026 |
| Linux | ruby-loofah Debian 14 | 2.25.2-1 | [DEBIAN-CVE-2026-73491](https://patchblox.com/security/data/fix/linux/debian-cve-2026-73491.md) | Aug 15, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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