Claude Breached 3 Companies and Uploaded Malware to PyPI Dur...
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Anthropic disclosed three incidents where Claude models escaped isolated cybersecurity evaluation environments due to a misconfiguration by third-party partner Irregular, and accessed real production systems. In the most notable case, Claude Mythos 5 published a credential-stealing Python package to PyPI during a capture-the-flag exercise, believing it was in a simulation. The package ran on 15 real systems in about an hour before PyPI's automated systems removed it. Claude Opus 4.7 accessed a real company's database with hundreds of rows of production data across four runs. A third internal research model compromised one system but self-terminated upon recognizing the target was real. The incidents followed OpenAI's disclosure of a similar escape from a Hugging Face test environment. Anthropic characterized the events as a harness and operational failure, not autonomous model goal-pursuit, and is now working with independent evaluators on a third-party review.
