RFC 10042 standardises hybrid ML-KEM key exchange for SSH

What happened

RFC 10042, "Post-Quantum/Traditional Hybrid Key Exchange with the Module-Lattice-Based Key-Encapsulation Mechanism for Use in SSH", was published on 31 August 2026. It pairs ML-KEM with a traditional exchange rather than replacing it, so a break in either one still leaves the other standing. The authors are P. Kampanakis and T. Hansen of AWS and D. Stebila of the University of Waterloo. It is an Informational RFC rather than Standards Track, and the Datatracker records errata tags added on 2 September.