Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer (CVE-2026-79770) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-79770

Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer

Answer in brief

CVE-2026-79770 records a Unknown severity vulnerability in Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer. The current sources do not mark it as known exploited. The current feed maps sparklemotion/nokogiri (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps sparklemotion/nokogiri (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
sparklemotion/nokogirigeneric	>=0 <1.19.3	1.19.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for sparklemotion/nokogiri.
Review the reported fix. Update sparklemotion/nokogiri to 1.19.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.