PT-2026-6392 · Npm · N8N

Published

2026-02-04

·

Updated

2026-02-04

CVSS v3.1

9.9

Critical

VectorAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Impact

A vulnerability in the Python Code node allows authenticated users to break out of the Python sandbox environment and execute code outside the intended security boundary.
Only authenticated users are able to execute code through Task Runners.
This issue affected any deployment in which the following conditions were met:
  • Task Runners were enabled using N8N RUNNERS ENABLED=true (default: false)
  • Python was enabled N8N PYTHON ENABLED=true
  • Code Node was enabled (default: true)
In case the N8N RUNNERS MODE is set to external (default: internal) the sandbox escape is limited to the sidecar container with lower risk for lateral movement. In that case a lower high severity is more appropriate.

Patches

This vulnerability is fixed in version 2.4.8 and later.

Workarounds

If an immediate upgrade cannot be applied, the following hardening steps are recommended:
  • Disable the Code Node by adding n8n-nodes-base.code to the NODES EXCLUDE environment variable
  • Prefer external mode for isolation: run Task Runners in external mode so that untrusted task code executes in a separate sidecar container rather than within the main n8n process. This configuration significantly reduces the risk of in-process memory disclosure caused by unsafe buffer allocations.In external mode, a launcher manages Task Runner processes in a dedicated sidecar environment, separate from the primary n8n instance. See the [n8n documentation](https://docs.n8n.io/hosting/configuration/task-runners/) for configuration details and required environment variables.

Resources

Fix

Protection Mechanism Failure

Weakness Enumeration

CWE-693

Related Identifiers

GHSA-8398-GMMX-564H

Affected Products

N8N