Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Loofah >= 2.1.0, < 2.19.1 is vulnerable to cross-site scripting via the image/svg+xml media type in data URIs. This issue is patched in version 2.19.1.
https://lists.debian.org/debian-lts-announce/2023/09/msg00011.html
https://hackerone.com/reports/1694173
https://github.com/flavorjones/loofah/security/advisories/GHSA-228g-948r-83gx