CVEvulnerability

CVE-2026-0863

9.9 CRITICAL Published 2026-01-18 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-01-18
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.5 HIGH — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1 ([email protected])
9.9 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-94, CWE-95

Description

Using string formatting and exception handling, an attacker may bypass n8n's python-task-executor sandbox restrictions and run arbitrary unrestricted Python code in the underlying operating system. The vulnerability can be exploited via the Code block by an authenticated user with basic permissions and can lead to a full n8n instance takeover on instances operating under "Internal" execution mode. If the instance is operating under the "External" execution mode (ex. n8n's official Docker image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact.

Affected configurations

• n8n n8n (<= 1.123.14) • n8n n8n (>= 2.0.0 <= 2.3.5) • n8n n8n (>= 2.4.0 <= 2.4.2)

Related

Weakness · CWE (2)

  • CWE-94 Improper Control of Generation of Code weakness
  • CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code weakness

References