CVEvulnerability

CVE-2026-56777

5.3 MEDIUM Published 2026-06-30 Modified 2026-10-25 Official page ↗
Status
Analyzed
Published
2026-06-30
Last modified
2026-10-25
Assigner
[email protected]
CVSS 4.0 ([email protected])
5.3 MEDIUM — CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
5.0 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Weaknesses
CWE-184

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.

Affected configurations

• n8n n8n (< 2.25.7) • n8n n8n (>= 2.26.0 < 2.26.2)

Related

Weakness · CWE (1)

  • CWE-184 Incomplete List of Disallowed Inputs weakness

References