CVE-2026-79770

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{"bugzilla": {"description": "nokogiri: Nokogiri: Denial of Service via crafted CSS selectors", "id": "2523562", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2523562"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "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.", "A flaw was found in Nokogiri. A remote attacker can inject specially crafted CSS selectors into methods such as `Node#css` or `Node#at_css`. This injection can lead to regular expression denial of service (ReDoS) due to exponential regex backtracking, causing the application to become unresponsive."], "mitigation": {"lang": "en:us", "value": "Do not pass untrusted user input directly into Nokogiri CSS search methods. If dynamic querying is necessary, sanitize input or restrict query parameter patterns before evaluation."}, "name": "CVE-2026-79770", "package_state": [{"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Affected", "package_name": "3scale-amp2/backend-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Affected", "package_name": "3scale-amp2/system-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Affected", "package_name": "3scale-amp2/system-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Affected", "package_name": "3scale-amp2/toolbox-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Affected", "package_name": "3scale-amp2/zync-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "tfm-rubygem-amazing_print", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "tfm-rubygem-graphql", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-08-25T15:16:03Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-79770\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-79770\nhttps://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgx\nhttps://www.vulncheck.com/advisories/nokogiri-before-redos-via-css-selector-tokenizer"], "statement": "A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in Nokogiri's CSS selector tokenizer. When processing untrusted user input passed to methods like Node#css, Node#at_css, or Searchable#search, an attacker can inject adversarial CSS selectors containing malicious string literals or identifiers. This triggers exponential regex backtracking within the parser, causing severe CPU exhaustion and leading to a Denial of Service (DoS) for the application thread.", "threat_severity": "Important"}

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