CVE-2026-79770

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-25. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

August 25, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Aug 25, 2026
Patch available. Sources: github.
github Patch Available

Regular expression backtracking in Nokogiri CSS selector tokenizer · Advisory · sparklemotion/nokogiri · GitHub

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-c4rq-3m3g-8wgx

Vendor Advisories for CVE-2026-79770(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.13.10+dfsg-2 ... 1.19.4+dfsg-1 (17 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.18.10+dfsg-1 ... 1.19.4+dfsg-1 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.18.10+dfsg-1, 1.18.10+dfsg-2, 1.18.10+dfsg-3, 1.18.2+dfsg-1, 1.19.1+dfsg-11.19.3+dfsg-1—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
nokogiri1.0.0 ... 1.9.1 (193 versions)1.19.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 59× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 21:39 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 21:09 UTCEG score recompute
  4. 2026-09-16 15:55 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 06:58 UTCEG score recompute
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 05:40 UTCEG score recompute
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-14 04:14 UTCEG score recompute
  12. 2026-09-12 15:28 UTCEG score recompute
  13. 2026-09-11 14:57 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-10 14:27 UTCEG score recompute
  17. 2026-09-09 01:14 UTCEG score recompute
  18. 2026-09-08 22:01 UTCEPSS rescore
  19. 2026-09-07 18:51 UTCEG score recompute
  20. 2026-09-06 18:13 UTCEG score recompute
  21. 2026-09-06 13:48 UTCEPSS rescore
  22. 2026-09-05 17:43 UTCEG score recompute
  23. 2026-09-04 17:09 UTCEG score recompute
  24. 2026-09-04 05:07 UTCEPSS rescore
  25. 2026-09-02 15:44 UTCEG score recompute
Show 34 more
  1. 2026-09-02 14:12 UTCEPSS rescore
  2. 2026-09-02 03:26 UTCGHSA enrichment
  3. 2026-09-01 15:04 UTCEG score recompute
  4. 2026-09-01 15:04 UTCGHSA enrichment
  5. 2026-09-01 13:54 UTCEPSS rescore
  6. 2026-09-01 09:10 UTCEG score recompute
  7. 2026-09-01 09:10 UTCGHSA enrichment
  8. 2026-09-01 04:40 UTCEPSS rescore
  9. 2026-09-01 04:40 UTCEPSS rescore
  10. 2026-08-31 20:53 UTCGHSA enrichment
  11. 2026-08-31 08:39 UTCGHSA enrichment
  12. 2026-08-30 20:11 UTCEG score recompute
  13. 2026-08-30 20:11 UTCGHSA enrichment
  14. 2026-08-30 19:18 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 07:57 UTCEG score recompute
  17. 2026-08-30 07:57 UTCGHSA enrichment
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-29 19:42 UTCGHSA enrichment
  20. 2026-08-29 07:28 UTCEG score recompute
  21. 2026-08-29 07:28 UTCGHSA enrichment
  22. 2026-08-28 21:42 UTCEPSS rescore
  23. 2026-08-28 19:07 UTCGHSA enrichment
  24. 2026-08-28 06:47 UTCGHSA enrichment
  25. 2026-08-27 18:31 UTCGHSA enrichment
  26. 2026-08-27 06:12 UTCGHSA enrichment
  27. 2026-08-26 17:54 UTCEG score recompute
  28. 2026-08-26 17:54 UTCGHSA enrichment
  29. 2026-08-26 14:47 UTCEPSS rescore
  30. 2026-08-26 05:40 UTCEG score recompute
  31. 2026-08-26 05:40 UTCGHSA enrichment
  32. 2026-08-25 16:24 UTCEG score recompute
  33. 2026-08-25 15:30 UTCEG score recompute
  34. 2026-08-25 15:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-79770?
CVE-2026-79770 is a high vulnerability published on August 25, 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…
When was CVE-2026-79770 disclosed?
CVE-2026-79770 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79770 actively exploited?
CVE-2026-79770 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.4% of all scored CVEs.
What is the CVSS score of CVE-2026-79770?
CVE-2026-79770 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-79770?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79770, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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