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ChatGPT is leaking passwords from private conversations of its users, Ars reader says
(arstechnica.com)
This is a most excellent place for technology news and articles.
It doesn't actually have memory in that sense. It can only remember things that are in the training data and within its limited context (4-32k tokens, depending on model). But when you send a message, ChatGPT does a semantic search of everything in the conversation and tries to fit the relevant parts inside the context, if there's room.
I'm familiar, it's just easiest for the layman to consider the model having "memory" as historical search is a lot like it at arm's length