{"id":"UBUNTU-CVE-2026-79770","details":"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.","modified":"2026-09-02T19:36:46.350226263Z","published":"2026-08-25T16:17:00Z","upstream":["CVE-2026-79770"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-79770"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-79770"},{"type":"REPORT","url":"https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgx"}],"affected":[{"package":{"name":"ruby-nokogiri","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.9-2","1.5.9-3","1.6.0-1","1.6.1+ds-1","1.6.1+ds-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-nokogiri","binary_version":"1.6.1+ds-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79770.json"}},{"package":{"name":"ruby-nokogiri","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.6.2+ds-2build2","1.6.6.3-1","1.6.7-1","1.6.7.1-1","1.6.7.2-3","1.6.7.2-3build1","1.6.7.2-3ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-nokogiri","binary_version":"1.6.7.2-3ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79770.json"}},{"package":{"name":"ruby-nokogiri","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.0-1","1.8.1-1","1.8.1-1build1","1.8.2-1build1","1.8.2-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.8.2-1ubuntu0.1","binary_name":"ruby-nokogiri"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79770.json"}},{"package":{"name":"ruby-nokogiri","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.3+dfsg1-2","1.10.4+dfsg1-1","1.10.7+dfsg1-1","1.10.7+dfsg1-2","1.10.7+dfsg1-2build1","1.10.7+dfsg1-2ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.7+dfsg1-2ubuntu0.1~esm2","binary_name":"ruby-nokogiri"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79770.json"}},{"package":{"name":"ruby-nokogiri","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.1+dfsg-2ubuntu1","1.11.7+dfsg-3","1.11.7+dfsg-3build1","1.13.1+dfsg-2","1.13.1+dfsg-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.13.1+dfsg-2ubuntu0.1~esm1","binary_name":"ruby-nokogiri"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79770.json"}},{"package":{"name":"ruby-nokogiri","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.3+dfsg-2","1.16.2+dfsg-1","1.16.2+dfsg-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.16.2+dfsg-1build1","binary_name":"ruby-nokogiri"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79770.json"}},{"package":{"name":"ruby-nokogiri","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/ruby-nokogiri?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.2+dfsg-1build1","1.18.10+dfsg-2","1.18.10+dfsg-3"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-nokogiri","binary_version":"1.18.10+dfsg-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79770.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}