CVE-2026-46442: FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape

May 14, 2026 (updated June 9, 2026)

POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node.

When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process.

The result is authenticated remote code execution on the Flowise server host. CVSS v3.1: AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H = 9.9 Critical.

References

Code Behaviors & Features

Detect and mitigate CVE-2026-46442 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →