Marimo RCE Bug Exploited in the Wild Just 10 Hours After Public Disclosure

A remote code execution vulnerability in Marimo, tracked as CVE-2026-39987, was weaponized by attackers within roughly 10 hours of its public disclosure. The rapid exploitation window underscores the shrinking gap between vulnerability disclosure and active abuse, giving defenders almost no breathing room to patch.

No additional details were available from the source beyond the headline. Key unknowns include affected versions, attack vector specifics, patch availability, and attribution of the in-the-wild exploitation. Organizations using Marimo - a Python-based reactive notebook environment - should check for vendor advisories and apply any available patches immediately.