The dependency firewall runs on your infrastructure, with none of your data leaving it. One proxy for npm, PyPI, NuGet, Maven, Go, Cargo, RubyGems, Dart, Composer, and Hex. EU-built, no phone-home, no per-developer fees.
Why ShieldedStack
Free and SaaS-first firewalls are useful when vendor-hosted workflows are acceptable. ShieldedStack is for teams that need dependency enforcement on infrastructure they control, under an EU vendor, with no package telemetry or audit data uploaded to someone else's cloud.
Compare the models in ShieldedStack vs Socket Firewall, or see flat annual pricing.
ShieldedStack is an intelligent security proxy that sits between your developers and ten package ecosystems. 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.
ShieldedStack is installed into your environment. Package traffic, findings, policies, user identities, and audit trails do not need to be uploaded to a vendor-hosted control plane.
A Denmark-based vendor and on-prem architecture help answer GDPR, NIS2, DORA, data residency, and procurement questions without redesigning the workflow.
Add developers, CI agents, and projects inside your licensed scope without converting every new engineer into another security-tool seat.
Every package download across your supported ecosystems 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 across ten package ecosystems, 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:
Free firewalls such as Socket Firewall can be a good starting point if SaaS workflows and plan limits fit your risk model. ShieldedStack is different because it runs on your infrastructure, does not upload package telemetry or audit data, is EU-built, and is licensed without per-developer fees. Snyk and Dependabot remain useful scanners, but they operate after packages have already reached your repository. See our ShieldedStack vs Socket Firewall, ShieldedStack vs Snyk, ShieldedStack vs Dependabot, and ShieldedStack vs JFrog pages for a full breakdown.
Point your package manager 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 ten package ecosystems: npm (Node.js/JavaScript), NuGet (.NET), PyPI (Python), Maven (Java), Go modules, Cargo (Rust), RubyGems (Ruby), and Dart (Dart and Flutter). 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 public package registries. 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.
For each vulnerability, ShieldedStack highlights the first patched version and provides practical remediation guidance. Where applicable, it includes ecosystem-specific upgrade commands so teams can move from alert to fix faster.
Partly. ShieldedStack does not host a private registry and does not control your package manager's resolution order. It does intercept every public-registry request, so an enforced allowlist blocks any public package you have not approved, including one published under the same name as an internal package, and the release grace period holds back newly published versions during the window when confusion and typosquat packages are most likely to be live.
Yes. ShieldedStack can export a Software Bill of Materials (SBOM) covering all packages observed flowing through the proxy across all supported ecosystems, giving you an accurate, continuously updated inventory for compliance and audit purposes.