"TL:DR Based on our investigation so far, Reddit user passwords and accounts are safe, but on Sunday night (pacific time), Reddit systems were hacked as a result of a sophisticated and highly-targeted phishing attack. They gained access to some internal documents, code, and some internal business systems."

https://www.reddit.com/r/reddit/comments/10y427y/we_had_a_security_incident_heres_what_we_know/