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OpenSSL 4.1.0 adds DTLS 1.3, GREASE and architecture optimizations
The OpenSSL project released version 4.1.0 on Oct. 23, a feature drop that adds DTLS 1.3, GREASE and IKEV2 KDF support, with several known DTLS 1.3 issues listed in the notes.
The OpenSSL project published version 4.1.0 on Oct. 23, describing it as a feature release that adds new protocol and algorithm support to the widely used cryptography library1.
The notes say the release includes DTLS 1.3 as specified in RFC 9147, with a new ossl-guide-dtlsv13 manual page, plus RFC 8701 GREASE (Generate Random Extensions And Sustain Extensibility) and DTLS support in the SSL listener API1.
Other additions listed are IKEV2 key-derivation function support and initial support for the Elbrus2000 (e2k) architecture1. The project also documents optimized ML-DSA and ML-KEM NTT work on ppc64le, optimized ML-DSA and AVX-512 SHAKE x4 paths for ML-DSA on x86_64, and AVX-512 and VAES optimizations for AES-CBC decryption on x86_641.
Incompatible or significant changes include dropping Windows-on-Itanium (VC-WIN64I) and Windows CE (VC-CE) configuration targets, and dropping Configure options no-ecdsa and no-ecdh that did not actually disable those implementations; the notes tell users to use no-ec instead1.
The tsget utility now uses Net::Curl::Easy from the Net-Curl CPAN distribution instead of the abandoned WWW::Curl::Easy; users who rely on tsget are told to install Net::Curl::Easy before upgrading1. New MSVC 2013 build targets were added to bridge C99 gaps1.
The same notes list known issues in 4.1.0, all tied to DTLS. A DTLS 1.3 KeyUpdate can drop other outstanding post-handshake records from the retransmission buffer, so messages still awaiting an ACK may not be resent if the original packet is lost; a fix is described as in progress for a later release1.
Other listed bugs: a permanent receive failure on a DTLS listener can surface as SSL_ERROR_WANT_READ on an accepted connection; a retryable write failure on a nonblocking connection from a DTLS listener can be reported as SSL_ERROR_SYSCALL instead of SSL_ERROR_WANT_WRITE; and DTLS 1.3 servers may abort handshakes with an unexpected_message alert when a client acknowledges part of the server's first flight before sending its response1.
The notes do not describe security advisories or CVE IDs for this tag. Whether operators should wait for a follow-up DTLS 1.3 patch is not addressed beyond the listed issue tracker items1.
