Exim 4.85 through 4.92 (fixed in 4.92.1) allows remote code execution as root in some unusual configurations that use the ${sort } expansion for items that can be controlled by an attacker (e.g., $local_part or $domain).
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-13917.json"