CVE-2026-56777: n8n

Medium severity, CVSS 5.0. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• n8n n8n: before 2.25.7 (fixed in 2.25.7); from 2.26.0, before 2.26.2 (fixed in 2.26.2)

Published 2026-06-30. Last modified 2026-07-02.