CVE-2026-79770Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
Updated under an hour ago ()
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It affects sparklemotion nokogiri and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-1333
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Sep 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
sparklemotion nokogiri sparklemotion:nokogiri (from the name) | before 1.19.3; 1.19.3 not affected | CNA record |
nokogiri nokogiri nokogiri:nokogiri | before 1.19.3 | NVD |
References
- https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgxvendor-advisory, mitigation
- https://www.vulncheck.com/advisories/nokogiri-before-redos-via-css-selector-tokenizerthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.