VULNERABILITY INTELLIGENCE

CVE-2026-0863

CVSS score8.5 HIGH

EPSS probability9.29%

CISA KEVNot currently listed

Published2026-01-18

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

Weakness classification

reefs@jfrog.com: CWE-95
nvd@nist.gov: CWE-94

Primary references

reefs@jfrog.com — Patch
reefs@jfrog.com — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Third Party Advisory