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Nx Package Supply Chain Attack: In-Depth Analysis of a Global Security Crisis Starting from GitHub Actions Vulnerability

On August 26, 2025, malicious versions of the popular Nx monorepo tool, downloaded 4 million times per week, were published to NPM, resulting in mass theft of sensitive information from developers worldwide. This incident (GHSA-cxm3-wv7p-598c) demonstrated a sophisticated multi-layered attack system, starting from a GitHub Actions pull_request_target workflow vulnerability, leading to NPM token theft, malicious package distribution, and sophisticated data collection exploiting AI CLI tools.