| Component | n8n |
| Severity | medium (CVSS 5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
| Published (NVD) | 2026-06-30 |
| Last modified | 2026-07-02 |
| Affected versions | n8n < 2.25.7 n8n >= 2.26.0, < 2.26.2 |
| Fixed in | 2.25.7, 2.26.2 |
| Weakness | CWE-184 |
| CISA KEV | not listed |
NVD description
n8n before 2.25.7 and 2.26.x before 2.26.2 contains an abstract syntax tree (AST) security validator bypass in the Python Code node. An authenticated user with permission to create or modify workflows containing a Python Code node can bypass the validator and access the task executor module namespace. The issue only affects self-hosted instances where the Python Task Runner is enabled; where N8N_BLOCK_RUNNER_ENV_ACCESS is configured to allow it, this can disclose environment variables accessible to the task runner process.
What to do
- Upgrade n8n to
2.25.7or later (or the patched release of your branch: 2.26.2). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-56777
- https://github.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5pp
- https://www.vulncheck.com/advisories/n8n-ast-validator-bypass-in-python-code-node
Read more
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