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CVE-2026-56777

5.3 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · n8nNVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*

References 2