RCE in N8n
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 image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact.
EPSS: 0.085 (94.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
Weakness classification (CWE)
References
- reefs@jfrog.com (Exploit, Third Party Advisory, third-party-advisory)
- reefs@jfrog.com (Patch, patch)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-0863?
- CVE-2026-0863 is a high-severity vulnerability in N8n, classified under Eval Injection. CVSS score: 8.5/10. Published 2026-01-18.
- How severe is CVE-2026-0863?
- High severity. CVSS v3 base score is 8.5 out of 10.