Errata patches for pf have been released for OpenBSD 6.3 and 6.4.

Fragmented IPv6 packets may be erroneously passed by pf or lead to a crash.

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.

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