In Wireshark 2.4.0 to 2.4.4, the DOCSIS protocol dissector could crash. This was addressed in plugins/docsis/packet-docsis.c by removing the recursive algorithm that had been used for concatenated PDUs.
https://www.wireshark.org/security/wnpa-sec-2018-08.html
https://lists.debian.org/debian-lts-announce/2018/04/msg00018.html