CVE-2026-86078
Published:September 08, 2026
Updated:September 22, 2026
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.
Affected Packages
https://github.com/n8n-io/n8n.git (GITHUB):
Affected version(s) >=n8n@2.30.0 <n8n@2.37.7Fix Suggestion:
Update to version n8n@2.37.7https://github.com/n8n-io/n8n.git (GITHUB):
Affected version(s) >=n8n@2.38.0 <n8n@2.38.2Fix Suggestion:
Update to version n8n@2.38.2n8n (NPM):
Affected version(s) >=2.38.0 <2.38.2Fix Suggestion:
Update to version 2.38.2n8n (NPM):
Affected version(s) >=0.0.1 <2.37.7Fix Suggestion:
Update to version 2.37.7n8n (NPM):
Affected version(s) >=2.30.0 <2.37.7Fix Suggestion:
Update to version 2.37.7Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
EPSS
Base Score:
0.33