Python CVE-2026-0863
HIGHCVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Authenticated users can exploit string formatting and exception handling in n8n's Python task executor to escape sandbox restrictions and execute arbitrary code on the underlying operating system, with full instance takeover possible in Internal execution mode. Public exploit code exists for this vulnerability, which affects n8n deployments running under Internal execution mode where the Python executor has direct OS access. …
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RemediationAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.
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External POC / Exploit Code
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