The incident has been described as one of the most significant code leaks in recent times, involving the exposure of Claude Code.
Anthropic had an uh-oh with Claude Code's internal source code. Here's what happened.
Security researcher Chaofan Shou posted on X, saying “Claude Code source code has been leaked via a map file in their npm ...
Anthropic accidentally leaked a large amount of internal code related to its Claude Code tool, exposing how the system works.
“The repo named in the notice was part of a fork network connected to our own public Claude Code repo, so the takedown reached more repositories than intended,” an Anthropic spokesperson told ...
Pesky humans.
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Update, Jan 13th, 2026: Multiple Target employees have now confirmed in our follow-up report the authenticity of leaked source code sample set and shared internal announcements regarding an access ...
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