MongoBleed explained simply
MongoBleed explained simplyCVE-2025-14847 allows attackers to read any arbitrary data from the database’s heap memory. It affects all MongoDB versions since 2017, here’s how it works:Stanislav KozlovskiDec 28, 202511ShareMongoBleed, officially CVE-2025-14847, is a recently-uncovered extremely sensitive vulnerability affecting basically all versions of MongoDB since ~2017.It is a bug in the zlib1 message compression path in MongoDB.It allows an attacker to read off any uninitialized heap memory, meaning anything that was allocated to memory from a previous database operation could be read.The bug was introduced in 20172. It is dead-easy to exploit – it only requires connectivity to the database (no auth needed). It is fixed as of writing, but some EOL versions (3.6, 4.0, 4.2) will not get…
