Memory leak in client induced by malicious server without CURVE/ZAP (rhbz#1921972).
Stack overflow on server running PUB/XPUB socket (rhbz#1921976).
Heap overflow when receiving malformed ZMTP v1 packets (rhbz#1921983).
Memory leaks via metadata messages processed by PUB sockets (rhbz#1921989).
Also, the cppzmq package has been rebuilt to fix the broken dependency on zeromq-devel.