CVE-2026-46442
FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
Impact
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, 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. This issue has been patched in version 3.1.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | flowise | <= 3.1.1 | 3.1.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Flowiseai | Flowise | before 3.1.2 |