Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| N8N | N8N | < 2.25.7 |
Related Weaknesses (CWE)
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5ppMitigationVendor Advisory
- https://www.vulncheck.com/advisories/n8n-ast-validator-bypass-in-python-code-nodThird Party Advisory
FAQ
What is CVE-2026-56777?
CVE-2026-56777 is a vulnerability with a CVSS score of 5.0 (MEDIUM). 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...
How severe is CVE-2026-56777?
CVE-2026-56777 has been rated MEDIUM with a CVSS base score of 5.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56777?
Check the references section above for vendor advisories and patch information. Affected products include: N8N N8N.