Errata patches for LibreSSL have been released for OpenBSD 6.7. The TLSv1.3 client could hang, crash, leak memory or not interoperate with some TLSv1.3 servers.
Binary updates for the amd64, i386, and arm64 platforms are available via the syspatch utility. Source code patches can be found on the errata page: https://www.openbsd.org/errata67.html