The "MongoBleed" vulnerability, identified as CVE-2025-14847, enables attackers to access and retrieve any uninitialized heap memory within MongoDB databases. Affecting all versions of MongoDB released since 2017 due to a flaw in the message compression pathway, exploitation merely necessitates establishing a connection to the database—authentication isn't required. While patches exist for current releases, older end-of-life versions such as 3.6, 4.0, and 4.2 remain vulnerable.