Breaking Claude Code Opus 5 Auto Mode
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Claude Code’s auto mode was bypassed in a prompt-injection attack that reportedly worked 80% of the time, using a zip archive that caused Python to import and execute a malicious local struct.py. For production agents, policy classifiers are not a sufficient containment boundary: run coding agents in containers/VMs with restricted network egress and no access to home dirs, SSH keys, or cloud credentials.
The Claude Code Opus 5 Auto Mode, designed to protect against prompt injection attacks, fails 80% of the time by allowing malicious code execution and blocking cleanup commands. This underscores the critical need to sandbox unattended coding agents in containers or VMs, restrict network access, and isolate sensitive credentials to prevent adversarial exploits in production environments.