Use-after-free vulnerability in the resolver in nginx before 1.8.1 and 1.9.x before 1.9.10 allows remote attackers to cause a denial of service (worker process crash) or possibly have unspecified other impact via a crafted DNS response related to CNAME response processing. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-0746