# OpenAI Explains ChatGPT Outage That Exposed User Data

OpenAI has released a detailed post-mortem of the March 20 ChatGPT outage that briefly exposed some users' personal information to others.

The company revealed that a bug in an open-source library caused approximately 1.2% of ChatGPT Plus subscribers to potentially see other users' chat titles, first and last names, email addresses, payment addresses, and partial credit card information during a nine-hour window.

The issue stemmed from a flaw in the Redis client library redis-py, which caused data corruption in the server's cache. When users requested their chat history, they occasionally received information belonging to other active users instead of their own.

OpenAI took ChatGPT offline for several hours to fix the problem and has since patched the vulnerable library. The company also implemented additional safeguards to prevent similar incidents,