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TI-2026-58883 Aliases CVE-2026-86078GHSA-679f-58pq-4v2c

n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service

Priority LOW 28CWE-1321Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the Instance AI workflow summary used node names and connection keys from stored workflows as ordinary object keys. A workflow submitted through the REST API could contain __proto__ or constructor, causing nested writes to reach Object.prototype in the main n8n process and disrupt later requests. The affected function is summarizeWorkflowStructure in packages/@n8n/instance-ai/src/tools/workflows/summarize-workflow.ts. This issue is fixed in versions 2.37.7 and 2.38.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00586 48th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 2.37.7, 2.38.2n8n (npm): 2.38.2, 2.37.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
n8nn8nbefore 2.37.7; 2.38.0 to before 2.38.22.37.7, 2.38.2Patch availableCNA
—n8n (npm)2.38.0 to before 2.38.22.38.2Patch availableGHSA-679f-58pq-4v2c
—n8n (npm)before 2.37.72.37.7Patch availableGHSA-679f-58pq-4v2c
  • n8n Vendorn8n Affected before 2.37.7; 2.38.0 to before 2.38.2 Fixed in 2.37.7, 2.38.2 Patch available CNA
  • n8n (npm) Vendor— Affected 2.38.0 to before 2.38.2 Fixed in 2.38.2 Patch available GHSA-679f-58pq-4v2c
  • n8n (npm) Vendor— Affected before 2.37.7 Fixed in 2.37.7 Patch available GHSA-679f-58pq-4v2c

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*before 2.37.7; 2.38.0 to before 2.38.2Vulnerablen8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:* Versions before 2.37.7; 2.38.0 to before 2.38.2 Vulnerable ·n8n

Remediation

  • Fix · CNA n8n (n8n-io) Fixed in 2.37.7, 2.38.2
  • Fix · GHSA-679f-58pq-4v2c n8n (npm) Fixed in 2.38.2 Advisory →
  • Fix · GHSA-679f-58pq-4v2c n8n (npm) Fixed in 2.37.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86078
  2. 2026-10-03 Alias added: GHSA-679f-58pq-4v2c

References

Advisory 2

Other 3

  • TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
  • TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
  • TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
  • TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
  • TI-2023-12275 The n8n package 0.218.0 for Node.js allows Escalation of Privileges. CVSS 3.1HIGH 8.8
See all 178 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences