An issue in the validate_email function in CTFd/utils/validators/__init__.py of CTFd 3.7.3 allows attackers to cause a Regular expression Denial of Service (ReDoS) via supplying a crafted string as e-mail address during registration.
- https://gist.github.com/salvatore-abello/4f01f3fa54672febc0a492a11a26592c
- https://github.com/salvatore-abello/salvatore-abello