Docker builds can fetch from any server on the internet. A compromised dependency could silently exfiltrate your build secrets.
Buildcage prevents this. Define allowed domains, and everything else is blocked.
Your Dockerfiles stay the same — no proxy injection, no certificate changes. TLS is never intercepted.
Drop-in builder for Docker Buildx and GitHub Actions.
- Audit mode to discover dependencies
- Restrict mode to enforce your allowlist
- Self-hostable for full control
Open source.
