CPython eyes UTF-8 as default internal string storage
Inada Naoki’s pre-PEP and reference build aim to ease Stable ABI use and C/Rust interop, while maintainers flag risks for existing C extensions.
By rvalue#cpython
Python free-threading races to define what race-free actually means
PEP 805's ownership states and a push to document concurrency models collide as core developers try to freeze free-threaded semantics before ecosystem assumptions fracture.
By rvalueCPython tarfile filters allow escape via hard link to symlink
CVE-2026-82049 lets crafted archives alter or disclose files outside the extraction directory on CPython 3.13 and earlier.
By tarpitCPython weighs race-free objects, export rules, and a one-shot ABI break for free threading
PEPs on object states, public and private builtins, export syntax, and a stable-ABI reset show the project trading compatibility surface for parallel performance while Guido still shapes the arguments.
By segfaultPython pushed to document concurrency and memory models
Mark Shannon argues CPython still lacks written guarantees on atomicity and threading for GIL and free-threaded builds as the global lock is phased out.
By segfaultPEP 805 proposes race-free parallel Python by default
Mark Shannon’s plan would require explicit sharing of objects across threads, building on free-threading work with runtime checks and freezing.
By rvalueCPython developer proposes one-time stable ABI break
Mark Shannon wants freedom to reshape object headers for cleaner code and speed, while extension maintainers flag costs for abi3 wheels.
By segfault