Issues

Issues

• PySlice::new leaks the start, stop, and step integer objects

  Bug

  PyO3/pyo3#6574 · opened on Nov 11, 2026

• Support #[pyclass] on generic structs with default types

  Feature

  PyO3/pyo3#6569 · opened on Nov 3, 2026

• AttachGuard::try_attach: Py_IsInitialized() check precedes Py_IsFinalizing(), so attach() during finalization calls PyGILState_Ensure (crashes CPython 3.14)

  PyO3/pyo3#6564 · opened on Oct 30, 2026
  1

• Generated pymethod helper coverage reflects only receiver-extraction errors

  Bug

  PyO3/pyo3#6545 · opened on Oct 24, 2026

• Allocation failure while restoring a lazy PyErr aborts the interpreter

  PyO3/pyo3#6540 · opened on Oct 21, 2026

• Source and notice provenance of copied OnceLock documentation (PR #4512)

  PyO3/pyo3#6527 · opened on Oct 14, 2026

• Undefined behavior with a pyclass w/ >16 byte alignment

  Bug

  PyO3/pyo3#6526 · opened on Oct 14, 2026
  4

• Reliable way to configure pyo3

  Feature

  PyO3/pyo3#6518 · opened on Oct 13, 2026
  2

• experimental-inspect: deriving IntoPyObject for a recursive enum fails with E0391

  PyO3/pyo3#6509 · opened on Oct 11, 2026
  1

• Simple enum with a user __repr__ gets two Py_tp_repr slots; Python 3.15 emits a DeprecationWarning

  Bug

  PyO3/pyo3#6494 · opened on Oct 9, 2026

• no_std support for thread locals and once cell

  PyO3/pyo3#6490 · opened on Oct 8, 2026
  2

• with_critical_section_mutex APIs probably should poison their mutexes

  Bug

  PyO3/pyo3#6460 · opened on Sep 28, 2026

• Xcode-provided python uses the wrong libdir

  Bug

  PyO3/pyo3#6415 · opened on Sep 14, 2026
  7

• Type stubs customization

  PyO3/pyo3#6399 · opened on Sep 9, 2026
  7

• Borrowed constructor argument can outlive its owner

  Bug

  PyO3/pyo3#6392 · opened on Sep 6, 2026
  1

• Assign an alias to a type hint

  Feature

  PyO3/pyo3#6347 · opened on Aug 24, 2026

• DefaultHasher for no_std

  PyO3/pyo3#6329 · opened on Aug 18, 2026
  4

• Use of PyPyModule_FromDefAndSpec2 is broken with pypy 7.3.19

  PyO3/pyo3#6305 · opened on Aug 6, 2026
  1

• sdist release of pyo3-introspection 0.29.2 failed

  PyO3/pyo3#6303 · opened on Aug 6, 2026
  1

• GlobalAlloc that uses PyMem_Raw* methods

  Feature

  PyO3/pyo3#6268 · opened on Jul 31, 2026
  21

• Unsoundness in buffer APIs

  PyO3/pyo3#6267 · opened on Jul 31, 2026
  7

• Python 3.15 final will allow including platform tags in stable abi extension filenames

  PyO3/pyo3#6258 · opened on Jul 28, 2026
  1

• experimental-inspect: Add stubtest test in CI to ensure generated stubfiles match binary interfaces

  Feature

  PyO3/pyo3#6240 · opened on Jul 25, 2026

• experimental-inspect: PyList / PyDict / PyTuple emit bare list / dict / tuple, which fail mypy --strict

  Bug

  PyO3/pyo3#6236 · opened on Jul 24, 2026

• PyDict::iter don't align with python semantics

  PyO3/pyo3#6222 · opened on Jul 21, 2026