nginx is vulnerable to denial of service. It was discovered that nginx could perform an out of bound read and dereference an invalid pointer when resolving CNAME DNS records. An attacker able to manipulate DNS responses received by nginx could use this flaw to cause a worker process to crash if nginx enabled the resolver in its configuration.
lists.opensuse.org/opensuse-updates/2016-02/msg00042.html
mailman.nginx.org/pipermail/nginx/2016-January/049700.html
seclists.org/fulldisclosure/2021/Sep/36
www.debian.org/security/2016/dsa-3473
www.securitytracker.com/id/1034869
www.ubuntu.com/usn/USN-2892-1
access.redhat.com/errata/RHSA-2016:1425
access.redhat.com/security/updates/classification/#moderate
bto.bluecoat.com/security-advisory/sa115
bugzilla.redhat.com/show_bug.cgi?id=1302587
security.gentoo.org/glsa/201606-06
support.apple.com/kb/HT212818