Prefab UI sandbox exposes untrusted Python to Deno permissions
Prefab UI's Generative UI sandbox runs caller-supplied Python in Pyodide inside a Deno subprocess and is documented as isolating untrusted code, including LLM-written UI. Versions 0.14.0 through 0.20.2 grant unrestricted file and network permissions, while leaving the Deno API accessible to Python.
Why it matters The flaw undermines a security boundary designed for AI-generated code.
- CVSS 10
- CRITICAL