It seems it may not relate to RHEL repository.
For your reference / information -
www.bleepingcomputer.com
www.theregister.com
For your reference / information -
Red Hat confirms security incident after hackers claim GitHub breach
An extortion group calling itself the Crimson Collective claims to have breached Red Hat's private GitHub repositories, stealing nearly 570GB of compressed data across 28,000 internal projects.
Red Hat repos raided, claims cybercrew, files stolen
: 570GB of data claimed to be stolen by the Crimson Collective
www.theregister.com