Answer in brief
CVE-2026-79770 records a High severity (CVSS 7.5) 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), nokogiri (rubygems), nokogiri (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. 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.
The current feed maps sparklemotion/nokogiri (generic), nokogiri (rubygems), nokogiri (rubygems). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:nokogiri:nokogiri:*:*:*:*:*:ruby:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| sparklemotion/nokogirigeneric | >=0 <1.19.3 | 1.19.3 |
| nokogirirubygems | >=0 <1.19.3 | 1.19.3 |
| nokogirirubygems | <1.19.3 | 1.19.3 |
Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
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.