CVE-2026-72769
High
Description
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.
SeverityHigh
CVSS8.1
Exploit probability—
Product
N8n
PublishedAug 11, 2026
First seenAug 11, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Update
- n8n n8n1.123.67, 2.31.5 or later
- n8n1.123.67, 2.32.1, 2.31.5 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| n8n n8n | v < 1.123.67, 2.0.0 ≤ v < 2.31.5, 2.32.0 | 1.123.67, 2.31.5 |
| n8nnpm | v < 1.123.67, 2.32.0 ≤ v < 2.32.1, 2.0.0-rc.0 ≤ v < 2.31.5 | 1.123.67, 2.32.1, 2.31.5 |
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