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CVE-2026-56777

CVE-2026-56777 · n8n - AST Validator Bypass in Python Code Node

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 5.3 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • n8n

    Versions
    • ≥ 0, < 2.26.2: Affected (semver)
    • 2.26.2: Not affected (semver)

    Update to 2.26.2

  • n8n

    Versions
    • ≥ 0, < 2.25.7: Affected (semver)
    • 2.25.7: Not affected (semver)

    Update to 2.25.7

  • n8n npm

    Affected ranges
    • SEMVER: ≥ 2.26.0, < 2.26.2

    Update to 2.26.2

  • n8n npm

    Affected ranges
    • SEMVER: < 2.25.7

    Update to 2.25.7

Original sources

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