Amazon Corretto 27 ships post-quantum TLS and compact object headers enabled by default

On September 17, 2026, AWS released Corretto 27, its free OpenJDK distribution, with hybrid post-quantum key exchange for TLS 1.3 and compact object headers turned on by default. Test these wins in non-critical environments, but keep your LTS workloads on Java 21 or 25 — this release is only supported through April 2027.