From bleepingcomputer.com
An unauthorized person gained access to a Docker Hub database that exposed sensitive information for approximately 190,000 users. This information included some usernames and hashed passwords, as well as tokens for GitHub and Bitbucket repositories.
According to a security notice sent late Friday night, Docker became aware of unauthorized access to a Docker Hub database on April 25th, 2019.
After performing an investigation it was determined that the database contained information for approximately 190,000 users. This information included access tokens for GitHub and Bitbucket repositories used for Docker autobuilds as well usernames and passwords for a small percentage of users.