'Agentic coding tools have access to everything they need for this': Security experts warn Claude Code can be…

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  • Claude Code ran the dangerous command while treating it as routine recovery
  • A single fake error message triggered the entire hidden attack chain
  • Static scanners and firewalls saw nothing more than normal DNS resolution

Researchers at Mozilla's 0din team have shown how Claude Code can be manipulated into opening a hidden reverse shell on a developer's device.

The exploit required no malicious code inside the cloned project, since every visible file passed ordinary review without raising suspicion.

Instead, the dangerous instruction arrived later, fetched at runtime from a DNS text record that no scanner would ever inspect.

How a Routine Setup Error Became an Entry Point

The attack began with an unremarkable Markdown file explaining how to install a package called Axiom, a common monitoring tool.

Running the tool without initialising it produced a plain error message instructing the user to execute a specific setup command.

The research teamnoted...

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