CVE-2026-72749: n8n before 1.123.67 Prototype Pollution via Edit Fields

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-11 · updated 2026-10-29
Weakness: CWE-1321

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.

Affected products

n8n-io n8n: before 1.123.67; from 2.31.0 before 2.31.5; 2.32.0 (and their updates) — fixed in 1.123.67, 2.31.5
n8n-io n8n: before 1.123.67 — fixed in 1.123.67

How to fix

Upgrade to a fixed version: n8n-io n8n 1.123.67, 2.31.5; n8n-io n8n 1.123.67. Check the vendor advisory for mitigations.

References

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