CVE-2026-56777 n8n - AST Validator Bypass in Python Code Node
Authenticated users can bypass AST validation in n8n's Python Code node to access task executor namespaces and potentially disclose environment variables.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56777?
CVE-2026-56777 is a medium-severity vulnerability in N8n N8n, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-184
Which versions are affected by CVE-2026-56777?
4 open source packages ship an affected version, including n8n. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
n8n npm | All versions | 2.25.7 |
n8n npm | All versions | 2.25.7 |
n8n npm | From 2.26.0 | 2.26.2 |
n8n npm | From 2.26.0 | 2.26.2 |
Products include N8n N8n.
How do I fix CVE-2026-56777?
Upgrade n8n to a fixed version for your release line: 2.25.7 or 2.26.2.
Is CVE-2026-56777 being exploited?
There is no known exploitation of CVE-2026-56777 in the wild and no public exploit code.
Other vulnerabilities in N8n N8n
- CVE-2025-68613 n8n Improper Control of Dynamically-Managed Code Resources
- CVE-2026-21877 n8n is vulnerable to Remote Code Execution via Arbitrary File Write
- CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
- CVE-2026-1470 n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution
- CVE-2025-68668 n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node
Sources
Also known as GHSA-jwm3-qcfw-c5pp, GHSA-x2rh-rhm8-cv8v, MINI-542r-f3j8-vxp6, MINI-6mgr-v25c-g9mm, ROOT-APP-NPM-GHSA-jwm3-qcfw-c5pp.