🛡️ CVE-2026-56777 — n8n

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-693 OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

n8n: Python Code Node AST Validator Bypass

Impact

An authenticated user with permission to create or modify workflows containing a Python Code node could bypass the AST security validator and access the task executor module namespace. On self-hosted instances where N8N_BLOCK_RUNNER_ENV_ACCESS=false is set, this extended to disclosure of environment variables accessible to the task runner process.

This issue only affects instances where the Python Task Runner is enabled and N8N_BLOCK_RUNNER_ENV_ACCESS=true.

Patches

The issue has been fixed in n8n versions 2.25.7, and 2.26.2. 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 NODES_EXCLUDE 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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2026-56777 is classified as CWE-693: Protection Mechanism Failure. A protection exists but does not cover the case at hand, so it can be worked around.

Affected software

CVE-2026-56777 is recorded against 1 package.

  • n8n

Timeline and source

Published on 16 June 2026 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE CWE-693
Public Exploit ✅ No
Source OSV
Published 2026-06-16
Updated 2026-08-12
Modified 2026-07-08
Fix URL N/A

Affected Packages

Software From version Fixed in
n8n — —

Similar Threats

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