The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty HTTP Content-Type header.
https://support.apple.com/kb/HT205031
https://support.apple.com/HT205219
https://security.gentoo.org/glsa/201610-02
https://exchange.xforce.ibmcloud.com/vulnerabilities/97027
https://bugzilla.redhat.com/show_bug.cgi?id=1149709
http://www.ubuntu.com/usn/USN-2523-1
http://www.securityfocus.com/bid/71656
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://svn.apache.org/viewvc?view=revision&revision=1624234
http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/CHANGES?view=markup&pathrev=1627749