PT-2026-54049 · N8N · N8N

Mistz1 · Published 2026-06-30 · Updated 2026-06-30 · CVE-2026-56777

NVD

CVSS v3.1

5.0

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

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

Incomplete List of Disallowed Inputs

Weakness Enumeration

CWE-184

Related Identifiers

CVE-2026-56777

Affected Products

N8N

References · 3

• https://github.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5pp · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-56777 · Security Note
• https://vulncheck.com/advisories/n8n-ast-validator-bypass-in-python-code-node · Note