CVE-2026-72749: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the Edit Fields (Set) node. The node assigns output fields via a dot-notation path setter without restricting the field name, allowing an authenticated user to name a field after an inherited built-in method path and corrupt a shared global in the main Node.js process. Because that global is used on the request-authentication path, the instance then fails every authenticated request, causing an instance-wide denial of service for all users until the process is restarted.
AI Analysis
Technical Summary
CVE-2026-72749 is a prototype pollution vulnerability in n8n's Edit Fields (Set) node. The vulnerability arises because the node assigns output fields using a dot-notation path setter without restricting field names, enabling an authenticated user to name a field after an inherited built-in method path. This corrupts a shared global object in the main Node.js process, which is used during request authentication. As a result, every authenticated request fails, causing an instance-wide denial of service until the process is restarted. The vulnerability affects n8n versions prior to 1.123.67, 2.31.5, and 2.32.1.
Potential Impact
An authenticated user can exploit this vulnerability to cause an instance-wide denial of service by corrupting a shared global object used in request authentication. This results in all authenticated requests failing until the n8n process is restarted, disrupting service availability for all users.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to authenticated users and monitor for unusual behavior. Restarting the n8n process restores service after exploitation.
CVE-2026-72749: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in n8n-io n8n
Description
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the Edit Fields (Set) node. The node assigns output fields via a dot-notation path setter without restricting the field name, allowing an authenticated user to name a field after an inherited built-in method path and corrupt a shared global in the main Node.js process. Because that global is used on the request-authentication path, the instance then fails every authenticated request, causing an instance-wide denial of service for all users until the process is restarted.
CVSS v4.0
Score 7.1high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-72749 is a prototype pollution vulnerability in n8n's Edit Fields (Set) node. The vulnerability arises because the node assigns output fields using a dot-notation path setter without restricting field names, enabling an authenticated user to name a field after an inherited built-in method path. This corrupts a shared global object in the main Node.js process, which is used during request authentication. As a result, every authenticated request fails, causing an instance-wide denial of service until the process is restarted. The vulnerability affects n8n versions prior to 1.123.67, 2.31.5, and 2.32.1.
Potential Impact
An authenticated user can exploit this vulnerability to cause an instance-wide denial of service by corrupting a shared global object used in request authentication. This results in all authenticated requests failing until the n8n process is restarted, disrupting service availability for all users.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to authenticated users and monitor for unusual behavior. Restarting the n8n process restores service after exploitation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-10T13:53:42.482Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7b1519bf8831d539b28a49
Added to database: 08/11/2026, 12:27:05 UTC
Last enriched: 08/11/2026, 12:44:08 UTC
Last updated: 08/11/2026, 18:54:08 UTC
Views: 4
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