Errata patches for a speculative execution flaw in Intel CPUs have been released for OpenBSD 6.2 and 6.1.
Intel CPUs contain a flaw called "Meltdown" which allows userspace programs to access kernel memory. Binary updates for the amd64 platform are available via the syspatch utility. Source code patches can be found on the respective errata pages: https://www.openbsd.org/errata61.html https://www.openbsd.org/errata62.html As these affect the kernel, a reboot will be needed after patching.