CVE-2026-77077

HIGHNVD 7.67.6—
EchelonGraph scoreMEDIUM confidence

Score 7.6 from GitHub Security Advisory (severity: HIGH) published 2026-08-20. NVD baseline CVSS 7.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.6EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.6Exploit: None knownExposed services: Not assessed

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

n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher.

CVSS v3
7.6
EG Score
7.6HIGHmedium confidence
EG Risk
34
EG Risk 34/100CISA 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
Severity76% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (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 20, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Aug 20, 2026
No fix on record yet. Sources: github.
generic

n8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution | Advisories | VulnCheck

https://www.vulncheck.com/advisories/n8n-before-remote-code-execution-via-eventemitter-prototype-pollution
githubMentions a patch (unverified)

JavaScript Task Runner VM Sandbox Escape via EventEmitter Prototype Pollution Leads to Remote Code Execution · Advisory · n8n-io/n8n · GitHub

https://github.com/n8n-io/n8n/security/advisories/GHSA-m3hg-p5r9-fg9h

Vendor Advisories for CVE-2026-77077(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 101× 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.

Showing the most recent 100 of 179 total refreshes for this CVE.

  1. 2026-10-07 05:18 UTCGHSA enrichment
  2. 2026-10-06 16:56 UTCEG score recompute
  3. 2026-10-06 16:56 UTCGHSA enrichment
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-06 03:38 UTCGHSA enrichment
  6. 2026-10-06 03:38 UTCEG score recompute
  7. 2026-10-06 03:38 UTCGHSA enrichment
  8. 2026-10-05 17:43 UTCEPSS rescore
  9. 2026-10-05 09:41 UTCEG score recompute
  10. 2026-10-05 09:41 UTCGHSA enrichment
  11. 2026-10-04 23:22 UTCEPSS rescore
  12. 2026-10-04 21:19 UTCGHSA enrichment
  13. 2026-10-04 05:11 UTCGHSA enrichment
  14. 2026-10-03 16:50 UTCEG score recompute
  15. 2026-10-03 16:50 UTCGHSA enrichment
  16. 2026-10-03 14:26 UTCEPSS rescore
  17. 2026-10-02 22:18 UTCEG score recompute
  18. 2026-10-02 22:18 UTCGHSA enrichment
  19. 2026-10-02 09:55 UTCGHSA enrichment
  20. 2026-10-01 21:33 UTCEG score recompute
  21. 2026-10-01 21:33 UTCGHSA enrichment
  22. 2026-10-01 19:50 UTCEPSS rescore
  23. 2026-10-01 09:08 UTCGHSA enrichment
  24. 2026-09-30 20:46 UTCEG score recompute
  25. 2026-09-30 20:46 UTCGHSA enrichment
Show 75 more
  1. 2026-09-30 08:24 UTCEG score recompute
  2. 2026-09-30 08:24 UTCGHSA enrichment
  3. 2026-09-29 15:24 UTCEPSS rescore
  4. 2026-09-28 21:39 UTCEG score recompute
  5. 2026-09-28 21:39 UTCGHSA enrichment
  6. 2026-09-28 13:52 UTCEPSS rescore
  7. 2026-09-28 04:25 UTCGHSA enrichment
  8. 2026-09-27 16:03 UTCEG score recompute
  9. 2026-09-27 16:03 UTCGHSA enrichment
  10. 2026-09-27 13:48 UTCEPSS rescore
  11. 2026-09-27 03:25 UTCEG score recompute
  12. 2026-09-27 03:25 UTCGHSA enrichment
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-26 00:28 UTCEPSS rescore
  15. 2026-09-25 13:07 UTCGHSA enrichment
  16. 2026-09-25 00:45 UTCEG score recompute
  17. 2026-09-25 00:45 UTCGHSA enrichment
  18. 2026-09-24 14:04 UTCEPSS rescore
  19. 2026-09-24 08:53 UTCGHSA enrichment
  20. 2026-09-23 20:31 UTCGHSA enrichment
  21. 2026-09-23 08:09 UTCGHSA enrichment
  22. 2026-09-22 19:47 UTCEG score recompute
  23. 2026-09-22 19:47 UTCGHSA enrichment
  24. 2026-09-22 16:01 UTCEPSS rescore
  25. 2026-09-22 03:52 UTCEG score recompute
  26. 2026-09-22 03:52 UTCGHSA enrichment
  27. 2026-09-21 21:09 UTCEPSS rescore
  28. 2026-09-21 15:29 UTCGHSA enrichment
  29. 2026-09-21 02:24 UTCEG score recompute
  30. 2026-09-21 02:24 UTCGHSA enrichment
  31. 2026-09-20 20:16 UTCEPSS rescore
  32. 2026-09-20 14:01 UTCGHSA enrichment
  33. 2026-09-20 01:39 UTCEG score recompute
  34. 2026-09-20 01:39 UTCGHSA enrichment
  35. 2026-09-19 13:17 UTCEG score recompute
  36. 2026-09-19 13:17 UTCGHSA enrichment
  37. 2026-09-19 00:55 UTCEG score recompute
  38. 2026-09-19 00:55 UTCGHSA enrichment
  39. 2026-09-18 19:28 UTCEPSS rescore
  40. 2026-09-18 12:30 UTCGHSA enrichment
  41. 2026-09-18 00:08 UTCEG score recompute
  42. 2026-09-18 00:08 UTCGHSA enrichment
  43. 2026-09-17 11:06 UTCGHSA enrichment
  44. 2026-09-16 22:43 UTCEG score recompute
  45. 2026-09-16 22:43 UTCGHSA enrichment
  46. 2026-09-16 14:08 UTCEPSS rescore
  47. 2026-09-16 09:45 UTCEG score recompute
  48. 2026-09-16 09:45 UTCGHSA enrichment
  49. 2026-09-16 05:15 UTCEPSS rescore
  50. 2026-09-15 19:55 UTCGHSA enrichment
  51. 2026-09-15 07:33 UTCEG score recompute
  52. 2026-09-15 07:33 UTCGHSA enrichment
  53. 2026-09-15 03:12 UTCEPSS rescore
  54. 2026-09-14 19:10 UTCGHSA enrichment
  55. 2026-09-14 06:17 UTCGHSA enrichment
  56. 2026-09-13 17:55 UTCEG score recompute
  57. 2026-09-13 17:55 UTCGHSA enrichment
  58. 2026-09-13 05:32 UTCGHSA enrichment
  59. 2026-09-12 17:10 UTCEG score recompute
  60. 2026-09-12 17:10 UTCGHSA enrichment
  61. 2026-09-12 15:02 UTCEPSS rescore
  62. 2026-09-12 04:48 UTCGHSA enrichment
  63. 2026-09-11 16:26 UTCEG score recompute
  64. 2026-09-11 16:26 UTCGHSA enrichment
  65. 2026-09-11 14:53 UTCEPSS rescore
  66. 2026-09-11 04:03 UTCGHSA enrichment
  67. 2026-09-10 15:39 UTCEG score recompute
  68. 2026-09-10 15:39 UTCGHSA enrichment
  69. 2026-09-10 09:35 UTCEPSS rescore
  70. 2026-09-10 02:57 UTCGHSA enrichment
  71. 2026-09-09 14:34 UTCGHSA enrichment
  72. 2026-09-09 02:06 UTCEG score recompute
  73. 2026-09-09 02:06 UTCGHSA enrichment
  74. 2026-09-08 22:01 UTCEPSS rescore
  75. 2026-09-08 03:57 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77077?
CVE-2026-77077 is a high vulnerability published on August 20, 2026. n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit…
When was CVE-2026-77077 disclosed?
CVE-2026-77077 was first published on August 20, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77077 actively exploited?
CVE-2026-77077 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77077?
CVE-2026-77077 has a CVSS v3 base score of 7.6 (NVD).
How do I remediate CVE-2026-77077?
No fix for CVE-2026-77077 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-77077 are linked in the Vendor Advisories panel on this page.

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