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Hidden Code in Claude Code Flags Chinese Users, Reverse-Engineering Reveals

  • AI Agents
  • Security
  • Software Dev & Coding

Anthropic's coding agent "Claude Code" was found to contain code that detects proxy-based access from China and covertly embeds that information into the system prompt, according to a reverse-engineering analysis of its binary. Around June 30, 2026, a Reddit user analyzed the Claude Code binary and reported that the logic had been embedded since version 2.1.91, released on April 2, 2026.

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