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.
History

Tue, 01 Sep 2026 15:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:*

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Tue, 25 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 25 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
First Time appeared Nokogiri
Nokogiri nokogiri
Weaknesses CWE-1333
CPEs cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:*:*:*
Vendors & Products Nokogiri
Nokogiri nokogiri
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-25T16:10:31.778Z

Reserved: 2026-08-25T14:29:43.528Z

Link: CVE-2026-79770

cve-icon Vulnrichment

Updated: 2026-08-25T16:10:28.512Z

cve-icon NVD

Status : Analyzed

Published: 2026-08-25T16:17:28.460

Modified: 2026-09-01T14:56:03.963

Link: CVE-2026-79770

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-25T15:16:03Z

Links: CVE-2026-79770 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T17:15:05Z