The package libnginx-mod-http-modsecurity 1.0.3-2 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/libnginx-mod-http-modsecurity -- More information about libnginx-mod-http-modsecurity: https://pkg.kali.org/pkg/libnginx-mod-http-modsecurity