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.

PUBLISHED Reserved 2026-01-12 | Published 2026-01-18 | Updated 2026-01-23 | Assigner JFROG

Problem types

CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Product status

References

research.jfrog.com/...er-sandbox-escape-jfsa-2026-001651077/ exploit

www.smartkeyss.com/...formatting-and-implicit-code-execution

research.jfrog.com/...er-sandbox-escape-jfsa-2026-001651077/ third-party-advisory

github.com/...ommit/b73a4283cb14e0f27ce19692326f362c7bf3da02 patch

cve.org (CVE-2026-0863)

nvd.nist.gov (CVE-2026-0863)

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