You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
urllib-slim was reported malicious
OSV:MAL-2026-1225 - Malicious code in urllib-slim (PyPI)

urllib-slim

This package was deleted from PyPI around 2026-03-04. Installing fails with:
$ pip3 install urllib-slim ERROR: Could not find a version that satisfies the requirement urllib-slim (from versions: none) ERROR: No matching distribution found for urllib-slim

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-03-03/ \ urllib-slim
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9.31
9.32