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a flaw in MongoDB Server’s zlib-based network message decompression logic, which is processed prior to authentication. By sending malformed, compressed network packets, an unauthenticated attacker can trigger the server to mishandle decompressed message lengths, resulting in uninitialized heap memory being returned to the client. This allows attackers to remotely leak fragments of sensitive in-memory data without valid credentials or user interaction.

At a code level, the vulnerability was caused by incorrect length handling in message_compressor_zlib.cpp. The affected logic returned the allocated buffer size (output.length()) instead of the actual decompressed data length, allowing undersized or malformed payloads to expose adjacent heap memory.