MongoBleed Vulnerability (CVE-2025-14847): Critical MongoDB Security Flaw Explained
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Summary
MongoBleed (CVE-2025-14847) is a critical security vulnerability affecting MongoDB databases since 2017. The bug exists in the zlib1 message compression path and allows attackers to read uninitialized heap memory, potentially exposing sensitive data from previous database operations. The vulnerability is easy to exploit, requiring only database connectivity without authentication. While a fix is available, some end-of-life versions (3.6, 4.0, 4.2) will not receive patches.
Key quotes
· 4 pulledMongoBleed, officially CVE-2025-14847, is a recently-uncovered extremely sensitive vulnerability affecting basically all versions of MongoDB since ~2017.
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.
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 it.
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