Cloudflare have purged all affected resources from the cache and are confident that this issue has now been resolved.

Cloudflare have released a fix for the issue. Please let us know via Twitter or our main GitHub repository if you continue to see issues.

Twitter: https://twitter.com/cdnjs or https://twitter.com/cdnjsStatus
GitHub: https://github.com/cdnjs/cdnjs/issues/13324

Cloudflare have identified the source of the issue and are currently working to roll out a fix to the missing CORS headers.

We have been made aware of some responses lacking CORS headers from the CDN service. We are working with Cloudflare, who have recently deployed changes, to resolve this.