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EUVD-2026-344201

fkie_cve-2026-69254

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, executeJavaScriptCode() accepted caller-provided nodeVMOptions and merged them over the default NodeVM security settings in packages/components/src/utils.ts. An authenticated attacker reaching packages/server/src/routes/node-custom-functions/index.ts could run a custom function that imported flowise-components/dist/src/utils.js, called executeJavaScriptCode() again with nodeVMOptions.require.builtin set to allow all built-in modules, and then required child_process to execute arbitrary system commands as root on the Flowise server. This issue is fixed in version 3.1.3.

GHSA-3769-jgqc-cxm7 — Flowise: RCE via NodeVM Sandbox Escape in executeJavaScriptCode() nodeVMOptions Override

Affected: npm: flowise, npm: flowise-components

### Summary A sandbox escape vulnerability in `executeJavaScriptCode()` allows any authenticated user to execute arbitrary system commands as root on the Flowise server. The function accepts caller-provided `nodeVMOptions` that override the default sandbox security settings via JavaScript's spread operator, allowing an attacker to re-enable blocked modules like `child_process` and `fs`.

### Details The vulnerability is in `packages/components/src/utils.ts` at line 1755:

```typescript const finalNodeVMOptions = { ...defaultNodeVMOptions, ...nodeVMOptions }

The executeJavaScriptCode() function (line 1569) creates a NodeVM sandbox with secure defaults that restrict which Node.js built-in modules can be required:

async (code, sandbox, options = {}) => { const { nodeVMOptions = {} } = options; // ... const defaultNodeVMOptions = { require: { builtin: builtinDeps, // restricted allowlist — blocks child_process, fs, os, etc. mock: secureWrappers }, eval: false, wasm: false } const finalNodeVMOptions = { ...defaultNodeVMOptions, ...nodeVMOptions } // ← VULN: caller overrides security settings const vm = new NodeVM(finalNodeVMOptions) } ``` The spread operator allows any caller to override require.builtin with ["*"], which permits all Node.js built-in modules including child_process.

**Taint 01: Route Registration**…

WID-SEC-W-2026-2589 — Flowise: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Flowise ausnutzen, um beliebigen Code auszuführen – sogar mit Root-Rechten –, erweiterte Privilegien zu erlangen, Sicherheitsmaßnahmen zu umgehen, Sitzungen zu kapern sowie Daten offenzulegen oder zu manipulieren.