CVE-2018-20803
A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries, which loop indefinitely in mathematics processing while retaining locks. This issue affects: MongoDB Inc. MongoDB Server v4.0 versions prior to 4.0.5; v3.6 versions prior to 3.6.10; v3.4 versions prior to 3.4.19.
Source: CVE-2018-20803