In Wireshark 2.2.0 to 2.2.6 and 2.0.0 to 2.0.12, the DICOM dissector has an infinite loop. This was addressed in epan/dissectors/packet-dcm.c by validating a length value.
https://www.wireshark.org/security/wnpa-sec-2017-27.html
https://lists.debian.org/debian-lts-announce/2019/03/msg00031.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13685
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1329