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.

Project Subscriptions

Vendors Products
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-679f-58pq-4v2c n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared N8n
N8n n8n
CPEs cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*
Vendors & Products N8n
N8n n8n
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


Wed, 09 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Description 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.
Title n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service
Weaknesses CWE-1321
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-09T16:03:58.476Z

Reserved: 2026-09-04T19:34:03.100Z

Link: CVE-2026-86078

cve-icon Vulnrichment

Updated: 2026-09-09T15:49:55.725Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-08T22:19:16.677

Modified: 2026-09-11T18:21:20.657

Link: CVE-2026-86078

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-13T20:06:00Z

Weaknesses