Cloudflare Fixes Flaw That Let One Container Read Another Customer's Leftover Disk Data

A vulnerability was discovered in Cloudflare Containers that allowed a paying customer to access data left behind by other customers' containers on the same server. This data was residual, coming from disk space previously used by other containers, and not from active workloads. The exposed data was not selectively accessible, meaning an attacker could not choose whose data to obtain. Cloudflare has fixed the flaw, which was reported by researchers. The issue was related to disk space that had been used and then released by earlier containers. Cloudflare has addressed the problem.