CVE-2026-67618: marimo before 0.23.15 contains a configuration injection vulnerability that allows notebook authors to exfiltrate operat

marimo (a Python notebook tool) before version 0.23.15 has a configuration injection vulnerability (a flaw where untrusted settings override safe ones) that lets notebook creators steal API keys. An attacker can hide a malicious base_url (the server address an AI request goes to) in notebook metadata, and when an operator opens the notebook and makes an AI request, marimo sends the operator's OpenAI API key to the attacker's server instead of the legitimate one, without requiring any code to actually run.