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Claude Code security flaw found days after source code leak

A critical security vulnerability has been found in Claude Code days after its source code was leaked. SecurityWeek reported the incident began when Anthropic distributed a debugging JavaScript source map to the npm repository during a Claude Code v2.1.88 update. Researcher Chaofan Shou (차오판 쇼우) shared the discovery on X, prompting analysis by developers worldwide. Adversa AI said it found a separate flaw that could allow bypassing command-blocking rules via prompt injection.