Marimo RCE Vulnerability Exploited in the Within 10 Hours of Disclosure

A critical vulnerability was disclosed in Marimo, an open-source reactive Python notebook platform. Less than 10 hours later, attackers successfully weaponized the flaw to steal sensitive cloud credentials, highlighting the extreme speed of modern threat actors. The security flaw is formally tracked as CVE-2026-39987 (formerly GHSA-2679-6mx9-h9xc) and carries a Critical CVSS v4.0 score of 9.3. […]

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