In Wireshark 2.4.0 to 2.4.5, the TCP dissector could crash. This was addressed in epan/dissectors/packet-tcp.c by preserving valid data sources.

References

• advisory https://lists.debian.org/debian-lts-announce/2018/05/msg00019.html
• advisory https://www.wireshark.org/security/wnpa-sec-2018-21.html
• report https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14472
• web https://code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=2d4695de1477df60b0188fd581c0c279db601978