AI BriefingSecure Credential Injection into HTTP Headers Using Vercel Sandbox
Key point
Vercel Sandbox automatically injects credentials into HTTP headers, keeping security outside the sandbox.
Details
Vercel Sandbox has released a feature that automatically injects credentials into HTTP headers when code inside the sandbox makes external requests. This allows API keys and tokens to be securely isolated outside the sandbox VM boundary, enabling apps to call authenticated services without directly accessing the credentials.
This feature is configured through the transform setting in network policies. When the sandbox sends an HTTPS request to a specific domain, the firewall adds or replaces the specified headers before forwarding the request.
Key features are as follows:
- Header overwrite: Completely replaces existing headers set by the sandbox code with injected headers, preventing credential theft.
- Domain matching: Supports exact domains or wildcards (such as
*.github.com), allowing injection to be triggered only for specific services. - Real-time updates: Injection rules can be updated without restarting the sandbox, enabling multi-step workflows such as injecting credentials during a setup phase and then removing them before executing untrusted code.
This is particularly optimized for AI agent workflows where prompt injection threats exist. Even if an agent is compromised, since credentials exist in a layer outside the VM, there is no data to steal.
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