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Polyfill supply chain attack embeds malware in JavaScript CDN assets
A major supply chain attack occurred when cdn.polyfill.io, a widely-used JavaScript polyfill CDN, was compromised after its acquisition by a Chinese company in 2024, affecting over 100,000 websites th
rough malicious code injection. The incident highlighted the security risks of CDN-hosted polyfills and led to recommendations for stronger security measures and alternative solutions.

Reasons to Read -- Learn:

  • critical security incident affecting over 100,000 websites, including major companies like Intuit and Hulu, through a compromised JavaScript polyfill CDN that could impact your own web applications.
  • specific security best practices for protecting against CDN supply chain attacks, including implementing Subresource Integrity (SRI), Content Security Policy (CSP), and using trusted CDN alternatives like Cloudflare's polyfill clone.
  • how to detect and mitigate similar security issues using Snyk Code's custom rules and VS Code extension, with practical examples of implementing security checks for CDN-sourced JavaScript libraries.
  • publisher: Developer security | Snyk
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