In Wireshark 2.2.0 to 2.2.3 and 2.0.0 to 2.0.9, the DHCPv6 dissector could go into a large loop, triggered by packet injection or a malformed capture file. This was addressed in epan/dissectors/packet-dhcpv6.c by changing a data type to avoid an integer overflow.
https://www.wireshark.org/security/wnpa-sec-2017-02.html
https://code.wireshark.org/review/#/c/19747/
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13345
http://www.securitytracker.com/id/1037694