https://www.samba.org/samba/history/ Samba 4.18.3 has been released with some bug fixes and security fixes. Current version in portage is 4.18.0
Fixed by: https://gitweb.gentoo.org/repo/gentoo.git/commit/net-fs/samba?id=0e22658d070792dd5d5373981a8ccb1c4a424416