The Alpha release of OpenSSL 3.3 is now live. This release is in accordance with our adoption of biannual time-based releases. As this is an alpha release, it is intended for development and testing purposes. It represents the first step in our planned release of OpenSSL 3.3. To view the full 3.3 release schedule please refer to this blog.

OpenSSL 3.3 will feature the following new features:

• QUIC qlog diagnostic logging support
• Support for the non-blocking polling of multiple QUIC connection or stream objects
• Support for optimised generation of end-of-stream frames for QUIC connections
• Support for disabling QUIC event processing when making API calls
• Support for configuring QUIC idle timeout durations
• Support for querying the size and utilisation of a QUIC stream’s write buffer
• RCU lock infrastructure for performance enhancements
• Support for RFC 9480 and RFC 9483 extensions to CMP
• Ability to disable OpenSSL usage of atexit(3) at build time
• Year 2038-compatible SSL_SESSION APIs
• Ability to automatically derive Chinese Remainder Theorem (CRT) parameters when requested
• Ability to ignore unknown algorithm names in TLS signature algorithm and group configuration strings
• Ability to configure a TLS 1.3 server to prefer PSK-only key exchange during session resumption

No further features or API changes are planned for 3.3 beyond those listed above. We will not be accepting any additional features for 3.3; any unmerged feature PRs will now be considered for 3.4.

The release process of OpenSSL 3.3 will be managed by Neil Horman (@nhorman). Details on the release schedule can be found on the new OpenSSL Release Schedule board on GitHub.