I've published a new white paper with Alpha-Omega about mitigating vulnerabilities in the many implementations of ZIP and tar, archive formats that are used by packaging ecosystems like , , , , , and others.

@pypiPython Package Index mitigated many of these vulnerabilities by aggressively pruning the allowed features of ZIP and tar archives published to PyPI while measuring and minimizing user impact.

Read the full report: pyfound.blogspot.com/2025/10/s

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