nginx before versions 1.15.6, 1.14.1 has a vulnerability in the ngx_http_mp4_module, which might allow an attacker to cause infinite loop in a worker process, cause a worker process crash, or might result in worker process memory disclosure by using a specially crafted mp4 file. The issue only affects nginx if it is built with the ngx_http_mp4_module (the module is not built by default) and the .mp4. directive is used in the configuration file. Further, the attack is only possible if an attacker is able to trigger processing of a specially crafted mp4 file with the ngx_http_mp4_module.
lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
mailman.nginx.org/pipermail/nginx-announce/2018/000221.html
seclists.org/fulldisclosure/2021/Sep/36
www.securityfocus.com/bid/105868
www.securitytracker.com/id/1042039
access.redhat.com/errata/RHSA-2018:3652
access.redhat.com/errata/RHSA-2018:3653
access.redhat.com/errata/RHSA-2018:3680
access.redhat.com/errata/RHSA-2018:3681
bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16845
lists.debian.org/debian-lts-announce/2018/11/msg00010.html
support.apple.com/kb/HT212818
usn.ubuntu.com/3812-1/
www.debian.org/security/2018/dsa-4335