Issues

• [BUG]: nightly wheels are versioned 3.1.0 = the PyPI release since #6125, so the SPEC 4 install recipe cannot pick them up

  pybind/pybind11#6182 · Filter by author glaziermag opened on Sep 22, 2026

• [BUG]: Repeated gil_scoped_acquire in a persistent C++ thread pool causes a PyThreadState_Clear hotspot on free-threaded CPython 3.14

  triage
  pybind/pybind11#6179 · Filter by author superajun-wsj opened on Sep 16, 2026
  1

• [BUG]: Intermittent null internals_pp_manager::get_pp() during concurrent subinterpreter imports on Windows

  triage
  pybind/pybind11#6174 · Filter by author rwgk opened on Sep 12, 2026
  1

• [BUG]: missing changelog for 3.1.0 on readthedocs

  triage
  pybind/pybind11#6168 · Filter by author bmerry opened on Sep 3, 2026

• [BUG]: -Wmaybe-uninitialized warnings in O3 optimization

  triage
  pybind/pybind11#6167 · Filter by author Sytoplis opened on Sep 2, 2026

• Fable 5.1 review of pybind11

  pybind/pybind11#6159 · Filter by author henryiii opened on Sep 1, 2026
  3

• [BUG]: cast_error using PYBIND11_OVERRIDE with implicitly converted opaque vectors

  triage
  pybind/pybind11#6080 · Filter by author ManuelSchneid3r opened on Jun 3, 2026

• Untrusted impersonation of the project at pybind11.com

  pybind/pybind11#6076 · Filter by author zerobitflux opened on May 23, 2026

• Collecting subinterpreter-related CI flakes

  pybind/pybind11#6071 · Filter by author rwgk opened on May 18, 2026
  3

• [BUG]: cmake: pybind11::embed target doesn't link to Python libs if find_package(Python) has been called previously

  triage
  pybind/pybind11#6063 · Filter by author antonio-rojas opened on May 14, 2026

• [BUG]: Document MSVC std::mutex ABI hazard with older msvcp140.dll and _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR

  triage
  pybind/pybind11#6053 · Filter by author XuehaiPan opened on May 4, 2026

• [BUG]: nullptr dereference in create_pp_content_once (internals.h)

  triage
  pybind/pybind11#6046 · Filter by author yobeonline opened on Apr 30, 2026

• [BUG]: 5 tests fail

  triage
  pybind/pybind11#6037 · Filter by author yurivict opened on Apr 14, 2026

• [BUG]: "Already defined" import error when reusing a value name in different enums

  triage
  pybind/pybind11#6031 · Filter by author azymohliad opened on Apr 7, 2026

• [BUG]: Objects created using __new__ are not registered for casting

  triage
  pybind/pybind11#6025 · Filter by author TheDreadedAndy opened on Mar 30, 2026

• [BUG]: std::move_constructible and pybind11::detail::is_move_constructible differ

  triage
  pybind/pybind11#5983 · Filter by author Simon-Lopez opened on Feb 8, 2026
  1

• [BUG]: Hijacked domain is confusing

  triage
  pybind/pybind11#5963 · Filter by author lgritz opened on Jan 18, 2026

• [BUG]: Security link goes nowhere

  triage
  pybind/pybind11#5962 · Filter by author lgritz opened on Jan 18, 2026

• [BUG]: Compilation failure with MSVC 17.12 (v14.44) and C++20: '_BACKUP_ITERATOR_DEBUG_LEVEL' undeclared

  triage
  pybind/pybind11#5956 · Filter by author loumalouomega opened on Jan 9, 2026

• [BUG]: Cross compilation (x86_64-linux -> armv7l) fails with LONG_BIT related errors

  triage
  pybind/pybind11#5945 · Filter by author doronbehar opened on Dec 24, 2025

• [BUG]: CMake add_subdirectory() interference from system-installed pybind11

  triage
  pybind/pybind11#5937 · Filter by author mheistermann opened on Dec 15, 2025
  1

• [BUG]: Compatibility issues between pybind11 and Py_LIMITED_API.

  triage
  pybind/pybind11#5905 · Filter by author 1271653627 opened on Nov 26, 2025
  1

• [BUG]: integral caster inconsistencies

  triage
  pybind/pybind11#5895 · Filter by author gentlegiantJGC opened on Nov 12, 2025

• [BUG]: py::py::mod_gil_not_used() maybe not support python 3.14.0 free threaded feature, when using callback function

  triage
  pybind/pybind11#5894 · Filter by author AeloriaDev opened on Nov 12, 2025

• [BUG]: Is Pybind11 cmake work for Windows py3.14t if only set PYTHON_EXECUTABLE?

  triage
  pybind/pybind11#5884 · Filter by author victor-zou opened on Oct 27, 2025
  1