Vendoring keeps a copy of every dependency inside your repository. A proxy keeps copies in a shared service outside it. Vendoring gives reviewable, offline builds at the cost of repository size and slower updates. A proxy gives central control and easy updates, but depends on the service being available.
What each approach means
With vendoring, the source of each dependency is committed next to your code. Builds read from the repository and need no network. Go supports this through a vendor directory, and some other ecosystems have similar patterns.
With a proxy, builds fetch from an internal service that caches the public registry. The repository holds a manifest and a lockfile, not the code.
Comparison
| Question | Vendoring | Registry proxy |
|---|---|---|
| Offline builds | Yes, by design | Only for cached packages |
| Code review of dependency changes | Visible as a diff in the pull request | Visible as a lockfile change, not the code itself |
| Repository size | Grows with every dependency | Unchanged |
| Central blocking of a bad package | Hard, every repository must be fixed | Easy, one rule |
| Finding who uses a package | Search every repository | Search one log |
| Update effort | Higher, you must refresh copies | Lower, a version bump |
| Outage risk | None from the registry | Depends on proxy uptime |
Where vendoring fits
Vendoring suits small applications, projects with strict reproducibility needs, and environments with no network. A reviewer can read the actual diff of a dependency update. That is a real advantage for sensitive code.
It is a poor fit for large organizations with hundreds of repositories, because applying a block or a patch across all copies is slow and easy to miss.
Where a proxy fits
A proxy suits most enterprises, since it provides one place for logging, rules and caching. It makes a block immediate and global.
Combine the two when it helps. Some teams vendor only a few critical or hard to obtain dependencies, and proxy the rest.
Security checks apply either way
Vendored code is still third party code. Scan it, include it in your inventory and track its license. A common failure is vendored copies falling out of the scanner's view because they are not in a manifest. Make sure your scanning covers the vendor directory.
Recommendation process
- List how many repositories and teams you have.
- Check whether builds must run offline.
- Decide how fast you need to block a bad package across the company.
- Choose a proxy as the default and vendor by exception, with the exception written down.
Quick check
Does vendoring make code safer?
It makes changes visible and builds repeatable, but the code can still be vulnerable or malicious. Scan vendored code like any other.
Can we do both?
Yes. Proxy by default and vendor specific dependencies that need offline or reviewable builds.
Safeguard scans dependencies and builds SBOMs, runs reachability analysis, and applies policies and gates on pull requests, so the rules in this post can be checked automatically. Autonomous fix PRs are off by default, with every category on Manual. You can run a free scan at gold.safeguard.sh/scan.
Last reviewed: 19 October 2026.
