# WARNING: The package 'internal-utils' was found on PyPI, but your organization's private index also hosts a package with the same name. pip selected PyPI because it has a higher version.

- **ID:** `python/pip-dependency-confusion-internal-package`
- **Domain:** python
- **Category:** auth_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

pip's default index priority allows a public package to shadow an internal package with the same name, a dependency-confusion attack vector.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |
| 3.11 | active | — | — |
| 3.12 | active | — | — |

## Workarounds

1. **** (90% success)
   ```
   pip install --index-url https://internal.example.com/simple internal-utils
   ```
2. **** (80% success)
   ```
   In pip.conf: `[global]\nindex-url = https://internal.example.com/simple\nextra-index-url = https://pypi.org/simple` and use a resolver that respects priority (e.g., uv with `--index-strategy unsafe-best-match` disabled).
   ```
3. **** (95% success)
   ```
   Register placeholder packages on PyPI for all internal names to prevent squatting.
   ```

## Dead Ends

- **** — Trusted-host only affects TLS verification, not index priority. (90% fail)
- **** — Pinning the version does not prevent pip from fetching that version from PyPI if it exists there. (70% fail)
- **** — Extra indexes are merged with PyPI, so the confusion risk remains. (85% fail)