# CVE-2026-79770

## Summary

- **CVE ID:** CVE-2026-79770
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-1333
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 25, 2026

## 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.

## Affected Products

- sparklemotion — nokogiri (0)
- sparklemotion — nokogiri (1.19.3)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._