Security updates for Wednesday

Security updates have been issued by Arch Linux (aubio, curl, lib32-curl, lib32-libcurl-compat, lib32-libcurl-gnutls, libcurl-gnutls, libu2f-host, python-django, python2-django, rdesktop, and runc), Debian (flatpak), Fedora (flatpak, pdns-recursor, rdesktop, tomcat, and xerces-c27), Mageia (cinnamon, docker, dovecot, golang, java-1.8.0-openjdk, jruby, libarchive, libgd, libtiff, libvncserver, opencontainers-runc, openssh, python-marshmallow, thunderbird, and transfig), openSUSE (python-slixmpp), Oracle (kernel), Red Hat (redhat-virtualization-host), Slackware (lxc), SUSE (curl, firefox, LibVNCServer, nginx, php7, python-numpy, runc, SMS3.2, and thunderbird), and Ubuntu (gvfs, python-django, snapd, and webkit2gtk).