Python: Security Fixes and Performance Optimizations
Python's development team merged 20 pull requests on May 9th, 2026, including critical security patches for tarfile and binary I/O operations, plus performance improvements for string and sequence operations. The updates also removed deprecated methods as part of the 3.16 cleanup.
Duration: PT2M16S
Episode overview
This episode is a short developer briefing from Python.
It explains recent repository work in plain language.
- Show: Python
- Published: 2026-05-09T10:01:29Z
- Audio duration: PT2M16S
Transcript excerpt
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Good morning. This is your Python development briefing for May 9th, 2026.
The CPython repository saw significant security and performance activity yesterday with 20 merged pull requests.
Petr Viktorin merged a critical security fix for tarfile's data filter, addressing vulnerabilities where crafted archives could create links pointing outside the destination directory. The patch validates written link targets and rejects members that resolve to the destination directory itself.
Maurycy Pawłowski-Wieroński merged updates to Binary Reader and Writer classes, implementing Py_fopen for audit hook and path-like support. This change enhances security auditing capabilities for binary I/O operations.
On the performance front, Neko Asakura merged optimizations for binary operations, exposing sequence repeat helpers that deliver 14-18% speed improvements for string, bytes, and tuple multiplication operations.
The deprecation cleanup continues as sobolevn removed the symtable.Class.get_methods method, previously deprecated and now fully removed in preparation for Python 3.16. The same contributor also cleaned up keyword parameter handling in the Python version of reduce.
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