| Component | n8n |
| Severity | high (CVSS 8.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
| Published (NVD) | 2026-01-18 |
| Last modified | 2026-06-17 |
| Affected versions | n8n <= 1.123.14 n8n >= 2.0.0, <= 2.3.5 n8n >= 2.4.0, <= 2.4.2 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-95CWE-94 |
| CISA KEV | not listed |
NVD 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.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep n8n off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-0863
- https://github.com/n8n-io/n8n/commit/b73a4283cb14e0f27ce19692326f362c7bf3da02
- https://research.jfrog.com/vulnerabilities/n8n-python-runner-sandbox-escape-jfsa-2026-001651077/
- https://www.smartkeyss.com/post/cve-2026-0863-python-sandbox-escape-in-n8n-via-exception-formatting-and-implicit-code-execution
Read more
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