In Wireshark 2.6.0 to 2.6.1, 2.4.0 to 2.4.7, and 2.2.0 to 2.2.15, the BGP protocol dissector could go into a large loop. This was addressed in epan/dissectors/packet-bgp.c by validating Path Attribute lengths.
lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html
www.securityfocus.com/bid/104847
www.securitytracker.com/id/1041608
bugs.wireshark.org/bugzilla/show_bug.cgi?id=13741
code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=36af43dbb7673495948cd65d0346e8b9812b941c
lists.debian.org/debian-lts-announce/2018/07/msg00045.html
www.wireshark.org/security/wnpa-sec-2018-34.html