NIXPKGS-2026-2038

GitHub issue published 10 hours ago

n8n - AST Validator Bypass in Python Code Node

Permalink CVE-2026-56777

5.3 MEDIUM

CVSS version (CVSS): 4.0
Attack Vector (AV): Network (N)
Attack Complexity (AC): Low (L)
Attack Requirement (AT): None (N)
Privileges Required (PR): Low (L)
User Interaction (UI): None (N)
Vulnerable System Impact Confidentiality (VC): Low (L)
Vulnerable System Impact Integrity (VI): None (N)
Vulnerable System Impact Availability (VA): None (N)
Subsequent System Impact Confidentiality (SC): Low (L)
Subsequent System Impact Integrity (SI): None (N)
Subsequent System Impact Availability (SA): None (N)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): Low (L)
Modified Attack Requirement (MAT): None (N)
Modified Privileges Required (MPR): Low (L)
Modified User Interaction (MUI): None (N)
Modified Vulnerable System Impact Confidentiality (MVC): Low (L)
Modified Vulnerable System Impact Integrity (MVI): None (N)
Modified Vulnerable System Impact Availability (MVA): None (N)
Modified Subsequent System Impact Confidentiality (MSC): Low (L)
Modified Subsequent System Impact Integrity (MSI): Negligible (N)
Modified Subsequent System Impact Availability (MSA): Negligible (N)
Safety (S): Not Defined (X)
Automatable (AU): Not Defined (X)
Recovery (R): Not Defined (X)
Value Density (V): Not Defined (X)
Vulnerability Response Effort (RE): Not Defined (X)
Provider Urgency (U): Not Defined (X)
Confidentiality Req. (CR): Not Defined (X)
Integrity Req. (IR): Not Defined (X)
Availability Req. (AR): Not Defined (X)
Exploit Maturity (E): Not Defined (X)

updated 10 hours ago by @LeSuisse Activity log

Created suggestion 17 hours ago
@LeSuisse ignored
3 packages
- n8n-nodes-carbonejs
- n8n-nodes-evolution-api
- n8n-task-runner-launcher
10 hours ago
@LeSuisse accepted 10 hours ago
@LeSuisse published on GitHub 10 hours ago

n8n - AST Validator Bypass in Python Code Node

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.