CVE-2026-79770

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 25, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Aug 25, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

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 rangeFix by version rangeDependents
ruby-nokogiri1.13.10+dfsg-2 ... 1.19.4+dfsg-1 (17 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-nokogiri1.18.10+dfsg-1 ... 1.19.4+dfsg-1 (7 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
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-1
  • every version up to 1.19.3+dfsg-1: fixed in 1.19.3+dfsg-1
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
nokogiri1.0.0 ... 1.9.1 (193 versions)
  • every version up to 1.19.3: fixed in 1.19.3
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 55× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-10 12:02 UTCEG score recompute
  3. 2026-10-09 20:07 UTCEPSS rescore
  4. 2026-10-09 04:23 UTCEG score recompute
  5. 2026-10-08 17:13 UTCEPSS rescore
  6. 2026-10-08 03:17 UTCEG score recompute
  7. 2026-10-07 23:48 UTCEPSS rescore
  8. 2026-10-06 21:15 UTCEG score recompute
  9. 2026-10-06 15:18 UTCEPSS rescore
  10. 2026-10-05 20:32 UTCEG score recompute
  11. 2026-10-05 17:43 UTCEPSS rescore
  12. 2026-10-05 08:05 UTCEG score recompute
  13. 2026-10-04 23:22 UTCEPSS rescore
  14. 2026-10-03 16:26 UTCEG score recompute
  15. 2026-10-03 14:26 UTCEPSS rescore
  16. 2026-10-02 21:33 UTCEG score recompute
  17. 2026-10-02 17:57 UTCEPSS rescore
  18. 2026-10-01 20:58 UTCEG score recompute
  19. 2026-10-01 19:50 UTCEPSS rescore
  20. 2026-09-30 20:15 UTCEG score recompute
  21. 2026-09-30 06:47 UTCEG score recompute
  22. 2026-09-29 15:24 UTCEPSS rescore
  23. 2026-09-28 23:22 UTCEG score recompute
  24. 2026-09-28 13:52 UTCEPSS rescore
  25. 2026-09-27 22:36 UTCEG score recompute
Show 74 more
  1. 2026-09-27 13:48 UTCEPSS rescore
  2. 2026-09-26 22:05 UTCEG score recompute
  3. 2026-09-26 15:59 UTCEPSS rescore
  4. 2026-09-26 00:28 UTCEPSS rescore
  5. 2026-09-25 01:26 UTCEG score recompute
  6. 2026-09-24 14:04 UTCEPSS rescore
  7. 2026-09-24 00:56 UTCEG score recompute
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 00:26 UTCEG score recompute
  10. 2026-09-22 16:01 UTCEPSS rescore
  11. 2026-09-21 23:54 UTCEG score recompute
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-20 23:25 UTCEG score recompute
  14. 2026-09-20 20:16 UTCEPSS rescore
  15. 2026-09-19 22:29 UTCEG score recompute
  16. 2026-09-18 21:39 UTCEG score recompute
  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-17 21:09 UTCEG score recompute
  19. 2026-09-16 15:55 UTCEG score recompute
  20. 2026-09-16 14:08 UTCEPSS rescore
  21. 2026-09-16 06:58 UTCEG score recompute
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-15 05:40 UTCEG score recompute
  24. 2026-09-15 03:12 UTCEPSS rescore
  25. 2026-09-15 03:12 UTCEPSS rescore
  26. 2026-09-14 04:14 UTCEG score recompute
  27. 2026-09-12 15:28 UTCEG score recompute
  28. 2026-09-11 14:57 UTCEG score recompute
  29. 2026-09-11 14:53 UTCEPSS rescore
  30. 2026-09-11 14:53 UTCEPSS rescore
  31. 2026-09-10 14:27 UTCEG score recompute
  32. 2026-09-09 01:14 UTCEG score recompute
  33. 2026-09-08 22:01 UTCEPSS rescore
  34. 2026-09-07 18:51 UTCEG score recompute
  35. 2026-09-06 18:13 UTCEG score recompute
  36. 2026-09-06 13:48 UTCEPSS rescore
  37. 2026-09-05 17:43 UTCEG score recompute
  38. 2026-09-04 17:09 UTCEG score recompute
  39. 2026-09-04 05:07 UTCEPSS rescore
  40. 2026-09-02 15:44 UTCEG score recompute
  41. 2026-09-02 14:12 UTCEPSS rescore
  42. 2026-09-02 03:26 UTCGHSA enrichment
  43. 2026-09-01 15:04 UTCEG score recompute
  44. 2026-09-01 15:04 UTCGHSA enrichment
  45. 2026-09-01 13:54 UTCEPSS rescore
  46. 2026-09-01 09:10 UTCEG score recompute
  47. 2026-09-01 09:10 UTCGHSA enrichment
  48. 2026-09-01 04:40 UTCEPSS rescore
  49. 2026-09-01 04:40 UTCEPSS rescore
  50. 2026-08-31 20:53 UTCGHSA enrichment
  51. 2026-08-31 08:39 UTCGHSA enrichment
  52. 2026-08-30 20:11 UTCEG score recompute
  53. 2026-08-30 20:11 UTCGHSA enrichment
  54. 2026-08-30 19:18 UTCEPSS rescore
  55. 2026-08-30 19:17 UTCEPSS rescore
  56. 2026-08-30 07:57 UTCEG score recompute
  57. 2026-08-30 07:57 UTCGHSA enrichment
  58. 2026-08-30 01:22 UTCEPSS rescore
  59. 2026-08-29 19:42 UTCGHSA enrichment
  60. 2026-08-29 07:28 UTCEG score recompute
  61. 2026-08-29 07:28 UTCGHSA enrichment
  62. 2026-08-28 21:42 UTCEPSS rescore
  63. 2026-08-28 19:07 UTCGHSA enrichment
  64. 2026-08-28 06:47 UTCGHSA enrichment
  65. 2026-08-27 18:31 UTCGHSA enrichment
  66. 2026-08-27 06:12 UTCGHSA enrichment
  67. 2026-08-26 17:54 UTCEG score recompute
  68. 2026-08-26 17:54 UTCGHSA enrichment
  69. 2026-08-26 14:47 UTCEPSS rescore
  70. 2026-08-26 05:40 UTCEG score recompute
  71. 2026-08-26 05:40 UTCGHSA enrichment
  72. 2026-08-25 16:24 UTCEG score recompute
  73. 2026-08-25 15:30 UTCEG score recompute
  74. 2026-08-25 15:29 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

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 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 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-79770?
CVE-2026-79770 has a CVSS base score of 7.5 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-79770?
A fix for CVE-2026-79770 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-79770 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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