OpenSSL 4.1 adds DTLS 1.3 and GREASE to the network crypto stack

On September 9, 2026, the first OpenSSL 4.1 alpha enabled DTLS 1.3 — shorter handshakes, forward secrecy and built-in post-quantum crypto — plus GREASE, the mechanism that stops middleboxes from ossifying TLS. For anyone running gateways, IoT fleets or UDP-based services, it is the signal to start planning the migration.