Cloudflare Fixes Containers Cross-Tenant Flaw Exposing Customer Data
8 Articles
8 Articles
Cloudflare fixes Containers cross-tenant flaw exposing customer data
Cloudflare has fixed a vulnerability in Containers and Sandboxes that allowed customers with a Workers Paid account to recover residual data from other customers' containers on the same physical host. [...]
Recently, Claudflare discovered a loophole that allowed clients to read other clients' container data. This article reviews the details of the gap and the reforms taken. Cloudflare's repair of a hole that allowed a client to read another client's disk data. Claudflare and researchers who discovered the loophole on Thursday revealed a flaw in Cloudflare's containers that allowed a client to read... the article appeared to repair Cloudflare's data…
Cloudflare Containers failed to recover residual data from other customers through Linux thin provisioning. Understand the problem.
Cyber Security News
IT Security News - cybersecurity, infosecurity newsCloudflare Containers Vulnerability Could Leak Data Between Customer Workloads
Cloudflare has patched a cross-tenant data exposure vulnerability in its Containers platform across its global, multi-tenant cloud computing infrastructure that could allow one customer’s workload to recover residual disk data left by another tenant on the same physical host. The issue also affected Cloudflare Sandboxes, which is built on Containers, but Cloudflare says it found […]
How Cloudflare addressed a cross-tenant data exposure vulnerability in Containers
On September 4, 2026, Oren Yomtov, a security researcher from Accomplish, responsibly reported a vulnerability affecting Cloudflare Containers and Cloudflare Sandboxes (which is built on Containers), through Cloudflare’s bug bounty program. Cloudflare has fully remediated the vulnerability, and we have no evidence that customer data has been compromised. This post was prepared in collaboration with Oren
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