In Wireshark 3.0.0, the IEEE 802.11 dissector could go into an infinite loop. This was addressed in epan/dissectors/packet-ieee80211.c by detecting cases in which the bit offset does not advance.
Wireshark Security Updates (Windows)-02
Wireshark Security Updates (Mac OS X)-02
openSUSE: Security Advisory for wireshark (openSUSE-SU-2020:0362-1)
SUSE SLED15 / SLES15 Security Update : wireshark (SUSE-SU-2020:0693-1)