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Large Language ModelsAI Coding AssistantsArs Technica AIPublished: Apr 1, 2026, 07:00 JST1 min read

Over half a million lines of Claude's CLI code exposed through a leaked map file, giving competitors access to Anthropic's source code.

Over half a million lines of Claude's CLI code exposed through a leaked map file, giving competitors access to Anthropic's source code.

3 Key Points

  1. 512,000 lines of Claude Code CLI source code became accessible due to an exposed map file

  2. The leak provides competitors and developers weeks of material to study and potentially reverse-engineer

  3. The incident highlights security risks of accidentally exposing debugging or build artifacts in production environments

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