Python: Free-Threading Safety and Asyncio Reliability Fixes
CPython landed major concurrency correctness fixes for the free-threaded build and asyncio, plus a tarfile security fix. The pattern is stability under threading and async edge cases.
Duration: PT2M19S
Episode overview
This episode is a short developer briefing from Python.
It explains recent repository work in plain language.
- Show: Python
- Published: 2026-11-05T14:08:27Z
- Audio duration: PT2M19S
Transcript excerpt
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Good morning, it's Thursday, November 5th, 2026, and here's what's happening in C Python.
The lead story is concurrency correctness. The most impactful work today hardens the free-threaded build and asyncio against races that cause corruption, crashes, or hangs.
First, free-threading safety. Pull request 156248 makes memory view thread-safe in the free-threaded build by keeping the underlying buffer pinned while other threads still have operations in flight. The goal stated in the change is negligible slowdown for both the G I L-enabled build and the uncontended…
Second, everyday asyncio reliability. Pull request 158957 fixes asyncio Barrier reusing a cancelled task's index, by calculating the index on demand during draining instead of assigning it up front. And pull request 160909 fixes a Windows hang where closing proactor sockets could raise connection reset error from…
Finally, hardening and security. Commit e 4 c 7 5 1 b refuses drive-relative paths in tarfile extraction filters, fixing C V E 2026-107784 reported on Windows. Pull request 161393 fixes a crash when passing invalid flags and traps to decimal context, and pull request 161293 makes tuple resize fail loudly if the…
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