Description
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.3, Loofah's SVG_ALLOW_LOCAL_HREF safelist lists textPath with lowercase spelling that does not match the HTML5 parser's element name and omits mpath, so external href and xlink:href values on those elements survive sanitization. Firefox fetches the attacker-chosen URL when a viewer renders the content, which can disclose the viewer's IP address, user agent, referrer, and access to hosts routable only from the viewer's network. Chrome and WebKit do not fetch these references, and the impact is a network request rather than script execution. The rails-html-sanitizer PermitScrubber reuses the affected safelist when SVG elements are permitted. This issue is fixed in version 2.25.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| flavorjones | loofah | < 2.25.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ruby-loofah | No fix yet | — |
| Ubuntu 26.04 LTS | ruby-loofah | No fix yet | — |
| Ubuntu 24.04 LTS | ruby-loofah | No fix yet | — |
| Ubuntu 22.04 LTS | ruby-loofah | No fix yet | — |
| Ubuntu 20.04 LTS | ruby-loofah | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | ruby-loofah | No fix yet | — |
| Ubuntu 16.04 LTS | ruby-loofah | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | loofah | < 2.25.3 | 2.25.3 | GHSA-345x-3rq2-jfrm |