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Cloudflare Containers can now let each Durable Object choose its own runtime — and snapshot its filesystem

The architectural shift is from application-wide container configuration toward individually managed stateful compute. A Durable Object can now start its own image and size, keep an independent lifecycle and restore filesystem state without treating every instance as part of one rollout.

Cloudflare Containers exposed previous tenants’ disk data through unzeroed blocks

This was not a Firecracker escape or access to a live victim disk. It was a storage-isolation failure underneath the sandbox: researchers recovered foreign directory structures, database pages and complete SQLite databases from reused blocks, and Cloudflare had to fix allocation plus retire existing disks and cached snapshots.

Cloudflare makes Python Workers GA — with Hyperdrive and first-class platform bindings

The Hyperdrive integration was the practical database unlock; the larger September 21 change is that Python Workers themselves are now GA. Cloudflare is explicitly positioning Python as a production language on Workers, with native platform bindings and framework support rather than an experimental compatibility layer.

Cloudflare’s AI crawler controls can now preserve search while refusing training

Cloudflare’s crawler controls now distinguish between refusing AI training and refusing the crawler itself. The new Disallow AI Training option is designed to keep search discoverability while expressing a training opt-out to operators that meet Cloudflare’s Accountable requirements.

Cloudflare Workers replaces 3MB and 10MB compressed bundle caps with one 64MiB uncompressed limit

The change makes heavier frameworks and dependency trees deployable to Workers without plan-specific compressed-size ceilings, but it also changes what builders need to measure: the operative limit is now uncompressed Total Upload rather than the gzip number they may have optimized around.