Security Update 2020-005 is recommended for all users and improves the security of macOS.
support.apple.com
Does anyone know if this is a fixed version of the Security Update? I have been experiencing some slowness over the last week and while I have had the original, problematic security update for some time (as well as the supplemental update) and wasn't at first experiencing problems, I couldn't think of any other reason for slowness. I did a reinstall from recovery of Mojave last night, and both Security Update 2020-005 and the Supplemental Update appeared after. I did Supplemental which got me Safari 14, and am now leery of Security.