CVE-2026-128069

Name	CVE-2026-128069
Description	rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Before 1.7.2, the HTML4 and HTML5 variants of Rails::HTML::SafeListSanitizer reuse one Rails::HTML::PermitScrubber across calls and mutate its tags and attributes without synchronization. In a multithreaded process, concurrent sanitize calls using different tags: or attributes: options can interleave and cause one call to use the other call's allowlist. If a permissive call admits a script element or event-handler attribute, output expected to be sanitized under a stricter policy can retain it and cause cross-site scripting when rendered. Applications that are single-threaded, use one identical allowlist everywhere, or provide a separate scrubber: are not affected. This issue is fixed in version 1.7.2.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ruby-rails-html-sanitizer (PTS)	bookworm	1.4.4-1	vulnerable
	trixie	1.6.2-1	vulnerable
	forky	1.7.1-1	vulnerable
	sid	1.7.2-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ruby-rails-html-sanitizer	source	(unstable)	1.7.2-1

Notes

https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-h7wh-q2qr-458c
https://github.com/rails/rails-html-sanitizer/issues/228
Fixed by: https://github.com/rails/rails-html-sanitizer/commit/15f764c3563d5dd9b97ad32eaa7454577ccec4b9 (v1.7.2)