A flaw was found in pymongo. When client-side field-level encryption is configured, the driver misinterprets Key Management Service (KMS) endpoint addresses ending in '.sock' as local Unix domain socket files rather than remote network hosts. An authenticated database user with permission to modify encryption key metadata can exploit this behavior to force the application into opening connections to local sockets on the host system. While data transmitted across these connections is limited to an initial Transport Layer Security (TLS) handshake, it may trigger unintended interactions with local services running on the application server.