Downloads for Zeek 4.0.6 and Zeek 4.2.1 are available:
Zeek: Get Zeek
https://download.zeek.org/zeek-4.0.6.tar.gz
https://download.zeek.org/zeek-4.2.1.tar.gz
See the release notes for details of the addressed bugs and security issues:
Release v4.0.6 · zeek/zeek · GitHub
Release v4.2.1 · zeek/zeek · GitHub
Binary packages for the new releases will also be available shortly: