CVE-2026-56777
MEDIUM
MEDIUM
Priority: 0.02
BB Relevance:
61/100
Published: 2026-06-30
Modified: 2026-10-29
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
Low
UI:
None
AT:
None
VC:
Low
VI:
None
VA:
None
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.
Weakness Classification (1)
Affected Software (4)
References & Advisories (2)
Third Party Advisory
Mitigation
Vendor Advisory