PyPI Implements New Security Measures to Prevent ZIP Parser Confusion Attacks
By
miketheman
Pure flour-power. Hearty enough to carry you through lunch.
Summary
The Python Package Index (PyPI) is implementing new restrictions to safeguard Python package installers from ZIP parser confusion attacks. This measure addresses discrepancies in extraction behavior between popular installers like uv and other Python-based tools. PyPI will issue warnings and eventually reject wheels with problematic ZIP features or incorrect RECORD files.
Key quotes
· 3 pulledThe Python Package Index is introducing new restrictions to protect Python package installers and inspectors from confusion attacks arising from ZIP parser implementations.
PyPI will begin warning and will later reject wheels that contain differentiable ZIP features or incorrect RECORD files.
This has been done in response to the discovery that the popular installer uv has a different extraction behavior to many Python-based installers.
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