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7/24/2026
NuGet supply-chain security gaps exposed by the Shai-Hulud npm worm

NuGet supply-chain security gaps exposed by the Shai-Hulud npm worm

Original: The NuGet gap Shai-Hulud exposed — and what we built to close part of it)

Short summary

The Shai-Hulud npm worm of September 2025 exposed supply-chain vulnerabilities by stealing maintainer credentials to auto-propagate malicious packages. This article examines whether .NET/NuGet has equivalent gaps, surveying existing defenses like package signing, ID prefix reservation, and OIDC trusted publishing. It concludes that while NuGet's protections are real, signed packages can still be malicious and MSBuild build-time hooks remain an attack surface.

  • •Shai-Hulud npm worm auto-propagated via stolen credentials, poisoning 500+ packages
  • •NuGet has signing, prefix reservation, and OIDC trusted publishing but these prove identity not intent
  • •MSBuild inline tasks and .targets files in packages can execute during build, creating an attack surface

Generated with AI, which can make mistakes.

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