We'll be connecting from international to international in SFO.
Our inbound (Air Canada from YVR so likely pre-cleared) has been pushed backwards by an hour so we now have 95 minutes left for a connection to another international flight on United.
Traveling with hand luggage only and issued on a single ticket.

Is that comfortably doable? If so is there any need to exit and clear security again?

Thanks for any advice!