Building secure, scalable agent sandbox infrastructure
browser-use.com
February 27, 2026
6 min read
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47/100
Summary
Browser Use operates millions of web agents using AWS Lambda for isolated execution and instant scaling. The infrastructure supports code execution in a secure sandbox environment, allowing agents to run Python, execute shell commands, and create files.
Key Takeaways
- Browser Use transitioned from using AWS Lambda for web agents to a more secure infrastructure utilizing Unikraft micro-VMs for agent execution.
- The new architecture isolates agents in a sandbox environment, preventing access to sensitive information and allowing for independent scaling and management.
- The control plane acts as a proxy, ensuring that sandboxes have no direct access to external resources, thus enhancing security.
- The system employs techniques such as bytecode-only execution, privilege dropping, and environment stripping to harden the sandbox against potential vulnerabilities.
Community Sentiment
Positives
- The adoption of Unikernels in more projects indicates a growing interest in efficient and secure AI infrastructure, which could enhance performance and scalability.
- Improvements in Unikraft's Cloud offering suggest that developer experience is being prioritized, making it more viable for production use.
Concerns
- Prompt injection vulnerabilities in LLMs pose significant risks, undermining the effectiveness of sandboxing and requiring constant supervision, which is impractical.
- The proposed hardening measures for security appear insufficient, relying on obscurity rather than robust solutions, which raises concerns about their effectiveness.
