In the light of yesterday’s large coordinated release of DNS related updates to various products, I would like to point you to the updated bind packages in the portage tree.
net-dns/bind-9.4.2_p1 is currently being marked stable on all supported architectures
net-dns/bind-9.5.0_p1 has been committed with unstable keywords
Nameservers should be updated quite soon, since this issue should be [...]