In Wireshark 2.2.0 to 2.2.6 and 2.0.0 to 2.0.12, the Bazaar dissector could go into an infinite loop. This was addressed in epan/dissectors/packet-bzr.c by ensuring that backwards parsing cannot occur.
https://www.wireshark.org/security/wnpa-sec-2017-22.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13599