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Anthropic accidentally leaked 512,000 lines of claude code source code via npm Anthropic exposed claude code source on npm, revealing internal architecture, hidden features, model codenames, and fresh security risks. Full analysis of the leak, 44 hidden features, dmca controversy, and security implications.
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However, anthropic's published npm package containing claude code v2.1.88 allegedly exposed the source map file cli.js.map, which contained the full and unobfuscated typescript source code What claude code users and enterprise customers should do now about the alleged leak while the source code leak itself is a major blow to anthropic's intellectual property, it poses a specific. It appears that anthropic scrambled to remove the npm package.
Anthropic accidentally leaked part of the internal source code for its coding assistant claude code, according to a spokesperson
The leak could help give software developers, and anthropic's. The entire source code of claude code, anthropic's official ai coding cli, was sitting in plain sight on the npm registry via a sourcemap file bundled into the published package. Anthropic's proprietary claude code cli tool has had its full typescript source code inadvertently exposed through a misconfigured npm package, after a security researcher discovered a leaked.map file referencing the unobfuscated codebase stored on anthropic's own cloud infrastructure. That's roughly what happened to anthropic on march 31, 2026
The company behind claude — one of the most capable ai assistants in the world — accidentally pushed the internal source code of claude code, its flagship ai coding tool, to the public npm registry. Who should read this and why If you use claude, build with ai tools, or simply follow the ai industry, this article is for you It breaks down anthropic's accidental source code leak in plain.
Before getting into the leak itself, it's worth understanding what exactly got exposed
It runs in your command line, reads your codebase, writes and edits files, runs commands, manages git workflows, and handles entire development tasks through natural language. Anthropic's claude source code leaked via npm, and threat actors are weaponizing it Here's what you need to know to protect your organization Anthropic accidentally leaked claude code's full source code via an npm source map
Early this morning, anthropic published version 2.1.88 of claude code npm package—but it was quickly discovered that package included a source map file, which could be used to access the. Anthropic says human error resulted in a leak that exposed claude code's source code The leaked code, which has since been copied to github, offers a look at the inner workings of the ai. How it technically happened anthropic uses bun as their javascript runtime — a toolchain they reportedly acquired in late 2025
Bun has a known bug (issue #28001, filed just twenty days before the incident) that causes source maps to be served in production even when disabled in configuration.
On march 31, 2026 anthropic accidentally published the full claude code source to the public developer registry, exposing roughly 500,000+ lines across ~2,000 files and an unreleased feature roadmap Security researchers and community contributors mirrored and dissected the code. The newest leak, first made public in an x post, appears to have happened after anthropic uploaded all of claude code's original code to npm, a platform developers use to share and update. According to the github upload of the exposed claude code source, the leak actually resulted from a reference to an unobfuscated typescript source in the map file included in claude code's npm package (map files are used to connect bundled code back to the original source).
