Errata patches for unbound and unwind have been released for OpenBSD 6.6 and 6.7.
Specially crafted queries may crash unbound and unwind. Both can be tricked into amplifying an incoming query. 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/errata66.html https://www.openbsd.org/errata67.html After patching, restart the unbound service.
