CVE-2026-56777

Medium

Description

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.

SeverityMedium

CVSS5.0

Exploit probability—

Product

N8n

PublishedJun 30, 2026

First seenJun 30, 2026

Weakness typeCWE-184CWE-184

How to fix

Update

n8n n8n2.25.7, 2.26.2 or later
n8n2.26.2, 2.25.7 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5pp

Affected products

Product	Affected versions	Fixed in
n8n n8n	v < 2.25.7, 2.26.0 ≤ v < 2.26.2	2.25.7, 2.26.2
n8nnpm	2.26.0 ≤ v < 2.26.2, v < 2.25.7	2.26.2, 2.25.7

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