rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Versions >= 1.0.3, < 1.4.4 are vulnerable to cross-site scripting via data URIs when used in combination with Loofah >= 2.1.0. This issue is patched in version 1.4.4.
https://lists.debian.org/debian-lts-announce/2023/09/msg00012.html
https://hackerone.com/reports/1694173
https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-mcvf-2q2m-x72m