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HIGH

CVE-2026-0863

CVSS v3

8.5

HIGH

EPSS Score

9.4 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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 imag

Technical details

Published
2026-01-18
Last Modified
2026-02-10

Frequently asked questions

What is CVE-2026-0863?

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 imag

Is CVE-2026-0863 actively exploited?

Active exploitation of CVE-2026-0863 has not been confirmed. Its EPSS score was 9.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-0863?

CVE-2026-0863 has a CVSS v3 base score of 8.5 (HIGH severity).

Is CVE-2026-0863 affecting your environment?

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