Null pointer dereference when an "empty" nick has been observed by Irssi (CVE-2018-7050).
Certain nick names could result in out of bounds access when printing theme strings (CVE-2018-7051).
When the number of windows exceed the available space, Irssi would crash due to Null pointer dereference (CVE-2018-7052).
Use after free when SASL messages are received in unexpected order (CVE-2018-7053).
Use after free when server is disconnected during netsplits (CVE-2018-7054).