Overall, the auditors didn't identify any high-severity issues in either of the codebases, which is great news. The audit did flag some issues, like weak signature verification, unintentional information leaks, and weak cryptographic hashes, but but ultimately noted that the codebases demonstrated best practices in the industry. The PyPI team has already made the repository safer by working to remediate the risks that came up in the audit.
The most notable change for this release, compared to 3.12, is the elimination of many modules. Python 3.13 closes out a deprecation schedule that began in Python 3.11 with PEP 594. If you've been using these deprecated modules on newer Python versions, then you've likely run into a DeprecationWarning.
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