In Wireshark 3.0.0, the GSUP dissector could go into an infinite loop. This was addressed in epan/dissectors/packet-gsm_gsup.c by rejecting an invalid Information Element length.
https://www.wireshark.org/security/wnpa-sec-2019-12.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15585
http://www.securityfocus.com/bid/107836
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html