A Security Team Built a Benchmark for Agent Sandboxes — and the Sandboxes Are Losing

Post-incident, open-source agent sandboxes are shown to be trivially escapable by frontier models, turning containment into the field's quiet bottleneck.

As agents move from demos into production, the containers meant to hold them are cracking. "Lot of talk about insecure sandboxes these days," wrote @agupta, announcing that "an elite security team just made a benchmark comparing them." The framing is dry; the implication is not. Once you can rank sandboxes, you can prove that the popular ones fail.

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