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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.

Meta Muse turns a consumer AI assistant into a persistent agent — and its first Mac zero-day tests the containment model

Muse packages persistent autonomous execution, credentials, payments, app access and memory into a mainstream consumer product. A September macOS hotfix now provides an early real-world lesson: agent containment has to protect not only the cloud runtime but also the local control path into the agent.

GitHub rewrote Copilot’s 800,000-line agent runtime in Rust with agents doing most of the coding

The useful part is not the 800,000-line headline. GitHub has published unusually detailed receipts for a production-scale agent-assisted migration: roughly $120,000 of token spend, 14.5 weeks of incremental releases, dozens of regressions, extensive compatibility tests and a workload-specific jump from 7.55 to 120 session lifecycles per second.

Homebrew 7.0 turns package vulnerability checks into a built-in workflow — after closing a sudo-capable cask flaw

The practical change is bigger than another package-manager version. Homebrew can now tell operators whether vulnerabilities are actually outstanding in the formula revisions they installed, while its own recent advisories show why package-manager metadata, uninstall paths and build isolation deserve the same scrutiny as package contents.

Cloudflare Browser Run can now hard-limit agent sessions to approved hostnames

The useful change is containment rather than another browser-agent feature. Teams can let an agent operate a real browser while constraining its HTTP and HTTPS reach to the site and dependencies the task actually needs, reducing the blast radius of prompt injection, bad tool decisions or untrusted page content.

Cognition’s Fusion uses a frontier lead and cheaper sidekick to cut coding-agent task cost

Fusion is interesting less as another routing feature than as a different agent-cost architecture: two persistent model contexts divide planning, review and execution instead of making one expensive model handle every token. The practical question for builders is shifting from token price to cost per completed task.

GitSpawn shows how a repository’s own Git config can escape AI coding-agent safety boundaries

The useful lesson is architectural rather than vendor-specific: coding agents inherit execution paths from ordinary developer tooling. If an agent shells out to Git without sanitising repository-local configuration, a hidden `.git/config` can become a host-level command channel that bypasses the controls users think govern the model.

Azure Document Intelligence v2.0 API retires August 31 — old integrations need a version migration

Azure Document Intelligence v2.0 reaches retirement on August 31, 2026. Microsoft recommends moving workloads to the current v4.0 API; the post-v2 REST surface was redesigned, so teams should verify the actual api-version their SDK or HTTP client sends rather than assuming a package upgrade is enough.

GitHub Spark is shutting down August 31 — export code now and replace broken `llm()` calls

GitHub Spark stops being available to existing users on August 31, 2026. Deployed apps are meant to keep running, but owners should export code to a repository now; Spark apps using `llm()` need a separate inference provider because the underlying GitHub Models service retired July 30.