CVE-2026-72769 PUBLISHED

n8n before 1.123.67 Prototype Pollution via VM Expression Engine

Assigner: VulnCheck
Reserved: 10.08.2026 Published: 11.08.2026 Updated: 11.08.2026

n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	n8n-io
Product	n8n
Versions	Default: unaffected affected from 0 to 1.123.67 (excl.) Version 1.123.67 is unaffected

Vendor	n8n-io
Product	n8n
Versions	Default: unaffected affected from 0 to 2.32.1 (excl.) Version 2.32.1 is unaffected

Vendor	n8n-io
Product	n8n
Versions	Default: unaffected affected from 0 to 2.31.5 (excl.) Version 2.31.5 is unaffected

References

Problem Types

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') CWE