CVE-2026-57436

Name	CVE-2026-57436
Description	Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.
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)
Debian Bugs	1140769

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ruby-nokogiri (PTS)	bullseye	1.11.1+dfsg-2	vulnerable
	bullseye (security)	1.11.1+dfsg-2+deb11u1	vulnerable
	bookworm	1.13.10+dfsg-2	vulnerable
	trixie	1.18.2+dfsg-1	vulnerable
	forky	1.19.1+dfsg-1	vulnerable
	sid	1.19.3+dfsg-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ruby-nokogiri	source	(unstable)	(unfixed)			1140769

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wjv4-x9w8-wm3h