ext/imap/php_imap.c in PHP 5.x and 7.x before 7.3.0 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty string in the message argument to the imap_mail function.
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2018-19935.json"