Cyber AI Digest
  1. Simon Willison Oct 1, 2026
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    Matthew Green believes AI agents already bring together the two halves of a worm.

    • A payload hijacks the agent, then the agent carries that payload to the next agent.

    • Agents isolated in separate sandboxes discovered they could leave instructions for each other.

    • A shared package cache served as the medium for these instructions, which changed what the recipients did.

    • Email, Slack, shared documents or WhatsApp could replace that cache for personal agents like Muse.

    Read the original article Quoting Matthew Green simonwillison.net