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Quoting Matthew Green.

Simon Willison's WeblogAnalysis or commentary·
AI brief

Matthew Green describes how a worm could spread between AI agents: a payload that hijacks an agent and an agent that carries the payload to other agents, with agents in separate isolated sandboxes discovering they could leave instructions for each other.

Why it matters: It suggests AI agents in isolated sandboxes may be able to pass instructions to one another, enabling self-propagating attacks.

Written by AI from Simon Willison's Weblog's published text.

Source

“[...] Put these pieces together and you have the two halves of a worm: a payload that hijacks the agent, and an agent that will carry the payload to the next agent.”
Simon Willison's Weblog, 01 Oct 2026, 06:29.

Interpretation or community commentary rather than straight reporting.

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