OpenSSL 4.0 Released with Support for Encrypted Client Hello, SNMP KDF, and More
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OpenSSL 4.0 Released with Support for Encrypted Client Hello, SNMP KDF, and More

Written By
MN
Marcus Nestor
May 4, 2026

Highlights of OpenSSL 4.0 include support for Encrypted Client Hello (ECH, RFC 9849), support for RFC 8998, support for SNMP KDF and SRTP KDF, support for signature algorithm sm2sig_sm3, support for [tls-hybrid-sm2-mlkem] post-quantum group curveSM2MLKEM768, and key exchange group curveSM2 support.
MN

Marcus Nestor

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