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Anthropic’s special Claude Code CLI tool had its complete TypeScript source code inadvertently exposed due to a misconfiguration in npm package. A security researcher found a leaked .map file that pointed to the clear code stored on Anthropic’s own cloud.
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Security researcher posted on x saying that
“Claude Code source code has been leaked via a map file in their npm registry!”.
The post quickly got people in the AI community talking. It got almost 10 million views and 1,500 comments.
It seems that Anthropic hurried to take down the npm package. But it was too late. Many GitHub users had already shared copies of the project.
The .map files are often used by developers to fix software programs. These plain text files work like a small map of the original code, helping developers find where the errors happen. But .map files usually don’t have the complete source code.
