In Wireshark 2.6.0, 2.4.0 to 2.4.6, and 2.2.0 to 2.2.14, the LTP dissector and other dissectors could consume excessive memory. This was addressed in epan/tvbuff.c by rejecting negative lengths.
lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html
www.securityfocus.com/bid/104308
www.securitytracker.com/id/1041036
bugs.wireshark.org/bugzilla/show_bug.cgi?id=14678
code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=ab8a33ef083b9732c89117747a83a905a676faf6
lists.debian.org/debian-lts-announce/2019/01/msg00010.html
www.wireshark.org/security/wnpa-sec-2018-28.html