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CVE-2026-79770

Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-79770

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-79770

Published

nokogiri

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "sparklemotion",
                    "product": "nokogiri",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:gem/nokogiri",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "1.19.3"
                        },
                        {
                            "version": "1.19.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON