CVE-2026-79770

Name	CVE-2026-79770
Description	Nokogiri versions before 1.19.3 contain regular expression denial of service vulnerabilities in the CSS selector tokenizer affecting string-literal and identifier tokenization. Attackers can inject adversarial CSS selectors into methods like Node#css, Node#at_css, and Searchable#search to cause exponential regex backtracking and denial of service.
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-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, sid	1.19.4+dfsg-1	fixed

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)	1.19.3+dfsg-1

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgx