The fragment_add_work function in epan/reassemble.c in the packet-reassembly feature in Wireshark 1.12.x before 1.12.5 does not properly determine the defragmentation state in a case of an insufficient snapshot length, which allows remote attackers to cause a denial of service (memory consumption) via a crafted packet.
https://security.gentoo.org/glsa/201510-03
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11129
http://www.wireshark.org/security/wnpa-sec-2015-16.html
http://www.securityfocus.com/bid/74633
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html