Anthropic's Claude Code Leak: 500K Lines Exposed - IT Security News

CySecurity News - Latest Information Security and Hacking Incidents, EN On March 31, 2026, Anthropic, the safety-focused AI company behind Claude, accidentally leaked over 500,000 lines of proprietary source code for its Claude Code tool through a public npm package update. This incident, the second such breach in a year, exposed nearly 2,000 TypeScript files via a misincluded debugging file in version 2.1.88, which linked to a publicly accessible zip archive on Anthropic's Cloudflare storage.Security researcher Chaofan Shou quickly spotted the error, sparking rapid mirroring on GitHub where repositories amassed thousands of stars before takedowns.