We've just released SRU 22 for Oracle Solaris 11.4. It is available via 'pkg update' from the support repository or by downloading the SRU from My Oracle Support Doc ID 2433412.1.
The following components have also been updated to address security issues:
Full details of this SRU can be found in My Oracle Support Doc 2679802.1. For the list of Service Alerts affecting each Oracle Solaris 11.4 SRU, see Important Oracle Solaris 11.4 SRU Issues (Doc ID 2445150.1).