High severity8.5OSV Advisory· Published Jan 18, 2026· Updated Jun 17, 2026
CVE-2026-0863
CVE-2026-0863
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.
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Affected products
2[email protected], [email protected], [email protected], …+ 1 more
- (no CPE)range: [email protected], [email protected], [email protected], …
- (no CPE)
Patches
Vulnerability mechanics
References
3- github.com/n8n-io/n8n/commit/b73a4283cb14e0f27ce19692326f362c7bf3da02nvdPatch
- research.jfrog.com/vulnerabilities/n8n-python-runner-sandbox-escape-jfsa-2026-001651077/nvdExploitThird Party Advisory
- www.smartkeyss.com/post/cve-2026-0863-python-sandbox-escape-in-n8n-via-exception-formatting-and-implicit-code-executionnvdExploitThird Party Advisory
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