SAMBA+ 4.18.6 has just been released by the Samba team at SerNet. Packages for various SUSE and Red Hat platforms as well as for Debian GNU/Linux, Ubuntu and AIX are available now.
These packages address several issues, which are listed in the release notes: https://www.samba.org/samba/history/samba-4.18.6.html
The fixes for the following issues were already included in the previous SAMBA+ release: