CVE-2026-42234: n8n: Python Task Runner Sandbox Escape
Impact An authenticated user with permission to create or modify workflows containing a Python Code Node could escape the sandbox and achieve arbitrary code execution on the task runner container.
- This issue only affects instances where the Python Task Runner is enabled.
Patches The issue has been fixed in n8n versions 1.123.32, 2.17.4, and 2.18.1. Users should upgrade to one of these versions or later to remediate the vulnerability.
Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Limit workflow creation and editing permissions to fully trusted users only. - Disable the Python Code node by adding n8n-nodes-base.code to the NODESEXCLUDE environment variable, or disable the Python Task Runner entirely.
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Other sources
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an authenticated user with permission to create or modify workflows containing a Python Code Node could escape the sandbox and achieve arbitrary code execution on the task runner container. This issue only affects instances where the Python Task Runner is enabled. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42234?
CVE-2026-42234 is considered a high severity vulnerability due to its potential for arbitrary code execution.
How do I fix CVE-2026-42234?
To fix CVE-2026-42234, upgrade to n8n version 2.17.4, 2.18.1, or 1.123.32.
Which versions are affected by CVE-2026-42234?
CVE-2026-42234 affects n8n versions from 2.17.0 to 2.17.4, and versions up to 1.123.32.
In which environments does CVE-2026-42234 pose a risk?
CVE-2026-42234 poses a risk in environments where the Python Task Runner is enabled.
Who is impacted by CVE-2026-42234?
Authenticated users with permissions to create or modify workflows containing a Python Code Node are impacted by CVE-2026-42234.