The update from macOS Mojave 10.14.2 to 10.14.3 is the smallest of Mojave’s updates so far, but is still substantial by any reckoning: a download of around 2.3 GB, it installs over 4 GB of updated files. Apple’s release notes only detail one change, an improvement to Kerberos authentication which may be of interest to enterprise users.
Security fixes are also few in number, but of those six are in the kernel, according to Apple’s detailed listing.
There are EFI firmware updates only for models with T2 chips (iMac Pro for certain). The standard installer contains a full set of current firmware updaters. I have already updated my list of current firmware versions.
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