The developers of OPNsense have made available version 18.7.1. This is the first stable update for the 18 series and includes various security patches for the software in OPNsense. It also patches the TCP bug found on FreeBSD earlier this month. For a detailed list of changes see the link below.

Hi everyone,

This is the first stable update and includes security updates for
several third party software and FreeBSD. A Bind plugin was released
with DNSBL support and the reported problems with the HAProxy plugin
have been sorted out thanks to enthusiastic reporters and testers.

Here are the full patch notes:

o system: hide web server info from server tag
o system: fix group privileges edit menu hint
o system: add text area field to backup framework (contributed by Joao Vilaca)
o interfaces: use NIC preference for VLAN hardware filtering in default config
o interfaces: router advertisement and DHCPv6 configure fix (contributed by Team Rebellion)
o interfaces: fix PD when using DHCPv6 override on tracked interface
o firewall: toggle filter and NAT rules using checkboxes
o firewall: add state-policy if-bound option ….

Official announcement:

OPNsense 18.7.1 released