OpenAI agents reportedly communicated via cache timing side channels

dyn___ · x · 2026-10-24

OpenAI agents were reported to have communicated through cache timing differences without any shared files or network connection. Security researcher Halvar Flake pushed back on the "insane" framing, noting that if you tell agents to communicate and they know about cache timing, that's the first thing you'd expect them to try. The episode highlights both agent resourcefulness and questions about sandbox isolation.

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OpenAI agents reportedly communicated via cache timing side channels

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