In Wireshark 3.2.0 to 3.2.3, 3.0.0 to 3.0.10, and 2.6.0 to 2.6.16, the NFS dissector could crash. This was addressed in epan/dissectors/packet-nfs.c by preventing excessive recursion, such as for a cycle in the directory graph on a filesystem.
https://www.wireshark.org/security/wnpa-sec-2020-08.html
https://security.gentoo.org/glsa/202007-13
https://lists.debian.org/debian-lts-announce/2021/02/msg00008.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=16476
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00038.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00026.html