As of MongoDB v4.0, several significant transport layer security changes have been made: TLS 1.0 is no longer supported if TLS 1.1 or above is available due to serious security vulnerabilities that were uncovered in TLS 1.0. Another change is that MongoDB v4.0 now uses the following native TLS/SSL libraries:
| Operating System | TLS/SSL Library |
| Windows | Secure Channel (https://docs.microsoft.com/en-us/windows/desktop/SecAuthN/secure-channel) |
| Linux/BSD | OpenSSL (https://www.openssl.org/) |
| Mac OS X | Secure Transport (https://developer.apple.com/documentation/security/secure_transport) |
Another change introduced in MongoDB v4.0 is the ability to retrieve keys and certificates from system stores when running on Mac ...
