There is a security update available for samba and ldb: https://www.samba.org/samba/history/samba-4.3.3.html
I'm testing that it builds now. When it's ready, should it go to master or security-updates, or some other branch? Here's what would be rebuilt: $ guix refresh -l ldb Building the following 5 packages would ensure 7 dependent packages are rebuilt: wine-1.7.52 mpv-0.14.0 kodi-15.2 gnome-shell-3.18.3 gvfs-1.26.2 $ guix refresh -l samba Building the following 5 packages would ensure 6 dependent packages are rebuilt: wine-1.7.52 mpv-0.14.0 kodi-15.2 gnome-shell-3.18.3 gvfs-1.26.2