Intelligent proxy for NuGet, npm, and PyPI with real-time threat detection. Enterprise-grade security with developer-friendly setup.
ShieldedStack is an intelligent security proxy that sits between your developers and package managers (NuGet, npm, PyPI). It intercepts every package download request, scans for known vulnerabilities in real-time, and blocks threats before they reach your codebase without slowing down your developers.
(Dependabot, Snyk, etc.)
(Network-Level Protection)
npm install, dotnet restore, and pip install
ShieldedStack gives you both: Network-level blocking + Package Scanner for existing code.
Every npm, NuGet, and PyPI package download is a potential backdoor into your enterprise. Between 2019 and 2022 supply chain attacks surged 742% and it’s only getting worse. Attackers increasingly target the open-source packages your developers trust most. The SolarWinds, Codecov, and event-stream attacks exposed a harsh reality: your security is only as strong as your weakest dependency.
The typical enterprise downloads thousands of packages monthly. Without visibility and control, each download could deliver malware, data exfiltration tools, or backdoors directly into your production environment.
This isn’t a theoretical risk. The numbers expose the scale of the threat facing every modern development team:
ShieldedStack sits invisibly between your developers and package managers (NuGet, npm, PyPI), acting as an intelligent security gateway that scans for known vulnerabilities and blocks threats in real-time before they reach your codebase.
See why dependency visibility matters. Analyze any package from NuGet, npm, or PyPI—including all transitive dependencies—without signing up.
ShieldedStack's hosted security console delivers end-to-end visibility and guided response with:
Snyk and Dependabot scan your repository after packages have already been downloaded and committed. ShieldedStack operates at the network level by intercepting every npm install, NuGet restore, or PyPI pip install before the package reaches your machine or CI environment. Vulnerable packages are blocked before they ever touch your codebase. See our ShieldedStack vs Snyk, ShieldedStack vs Dependabot, ShieldedStack vs JFrog, and ShieldedStack vs Socket Firewall pages for a full breakdown.
Point your npm, NuGet, or PyPI client at ShieldedStack's proxy endpoint. All package download requests flow through ShieldedStack, which scans each package against a real-time CVE database and blocks any version that violates your configured severity policy—before the package is delivered to your build agent or developer machine.
Yes. ShieldedStack supports all three major package ecosystems: npm (Node.js/JavaScript), NuGet (.NET), and PyPI (Python). You configure each client to use ShieldedStack as its proxy, and protection is applied uniformly across all ecosystems from a single policy console.
A package security proxy sits between your developers or CI systems and the public package registry (npm, NuGet, PyPI). Every download request passes through the proxy, which inspects the package for known CVEs, malicious code indicators, license issues, and policy violations—then either allows or blocks the download in real time.
Yes. ShieldedStack's policy engine lets you configure severity thresholds (Critical, High, Medium, Low) independently for different environments. For example, you can hard-block Critical CVEs in production CI while only alerting on Medium severity in development.
Yes. Because ShieldedStack controls and proxies all package resolution, it can enforce allowlists and private registry priorities that prevent malicious public packages from shadowing your internal packages—a key vector in dependency confusion attacks.
Yes. ShieldedStack can export a Software Bill of Materials (SBOM) covering all packages observed flowing through the proxy—across npm, NuGet, and PyPI—giving you an accurate, continuously updated inventory for compliance and audit purposes.