Errata patches for the kernel have been released for OpenBSD 6.3 and 6.4. Missing length checks in the NFS server and client can lead to crashes and other errors.
Binary updates for the amd64, i386, and arm64 platforms are available via the syspatch utility. Source code patches can be found on the respective errata page: https://www.openbsd.org/errata63.html https://www.openbsd.org/errata64.html As these affect the kernel, a reboot will be needed after patching.
