A vulnerability was found in dovecot before version 18.104.22.168 where mail with group address as sender will cause a signal 11 crash in push notification drivers. Group address as recipient can cause crash in some drivers.
Created dovecot tracking bugs for this issue:
Affects: fedora-all [bug 1783256]
The vulnerable functionality is not present in the versions of dovecot package in Red Hat Products therefore they are not affected by this flaw.