NGINX Post-Quantum TLS: X25519MLKEM768 with OpenSSL 3.5

by Danila Vershinin, August 29, 2026

Our RPM and DEB builds now link OpenSSL 3.5, so hybrid post-quantum key exchange with X25519MLKEM768 works out of the box on every platform we package for — from RHEL 8 to Ubuntu 20.04. Here is how to verify it, and the one common hardening directive that silently turns it off.