CVE-2026-79770

HIGH 7.5

Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1333
Vendor	sparklemotion
Product	nokogiri
Published	Aug 25, 2026
Last Updated	Aug 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

sparklemotion / nokogiri

0 < 1.19.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgx vulncheck.com: https://www.vulncheck.com/advisories/nokogiri-before-redos-via-css-selector-tokenizer

Credits

🔍 colby-swandale flavorjones