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

Cloudflare Fixes Flaw That Let One Container Read Another Customer's Leftover Disk Data Swati KhandelwalSep 25, 2026Cloud Security / Vulnerability A flaw in Cloudflare Containers let a paying customer read data that other customers' containers had left behind on the same server, Cloudflare and the researchers who found it said on Thursday. The data came from disk space that earlier containers had used and given up, not from any live workload, and an attacker could not choose whose data they got, according to Cloudflare. The company has fixed the flaw across its service and says customers need to do nothing. Cloudflare Containers runs customers' programs inside containers on servers shared by many accounts, and Cloudflare, not the customer, picks the…