In Dovecot before 2.3.9.2, an attacker can crash a push-notification driver with a crafted email when push notifications are used, because of a NULL Pointer Dereference. The email must use a group address as either the sender or the recipient.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-19722.json"