Last Tuesday, October 17th 2017, Oracle Solaris 11.3 Support Repository Update (SRU) 25 was released and in now available for download on My Oracle Support Doc ID 2045311.1 and detailed information on this release is available at My Oracle Support Doc ID 2316155.1.
As this the October SRU it has the special status of Critical Patch Update (CPU) which is Oracle's quarterly update focused on bringing the optimal stability and security. In other words this is the one in three SRUs that is only intended to have patches and not new features. The CPUs are therefore the ideal version to run in production on systems that need to be conservative and yet up to date with the latest security fixes.
As such the main highlights are about bringing updates to existing packages to address existing issue. Here are some of the most noteworthy updates in this CPU:
To understand the full list of which issues (and their bug IDs) and CVE's have been addressed with this release as well as other details like which packages were updated and End Of Feature (EOF) announcements, please go to the My Oracle Support information document linked above.