CVE-2026-77077

What it is

n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-08-20 12:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-01 19:44 UTC Last updatedMost recent change to the record

Details

Published

2026-08-20 12:16 UTC

Last modified

2026-09-01 19:44 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-94 · Code injection

Record status

Analyzed

Affected

• n8n < 1.123.69
• n8n < 2.33.4
• n8n 2.34.0

Attack profile CVSS 4.0 · 7.2

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

Low

User interaction

None

Confidentiality

High

Integrity

Low

Availability

Low