A critical flaw in Python tool Marimo was exploited within 10 hours of disclosure, researchers report, highlighting how quickly attackers are now turning vulnerability advisories into real-world ...

A threat actor started exploiting CVE-2026-39987, an unauthenticated RCE vulnerability in Marimo, nine hours after public disclosure.

Overview The Jupyter notebook system gives Python users a visual, interactive way to run code, display the results, and share the source with others. But Jupyter notebooks have limited interactivity.

Marimo CVE-2026-39987 exploited within 10 hours of disclosure, enabling unauthenticated RCE and credential theft, emphasizing urgent patching needs.