Issues

• [BUG]: Data race in class_::init_instance() on free-threaded builds

  triage
  pybind/pybind11#6214 · Filter by author YukaSadaoka opened on Oct 24, 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]: -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

• 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
  3

• [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]: 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]: KeysView/ItemsView does not support set operations

  triage
  pybind/pybind11#5876 · Filter by author InvincibleRMC opened on Oct 21, 2025

• [BUG]: 5 tests fail on FreeBSD

  triage
  pybind/pybind11#5872 · Filter by author yurivict opened on Oct 15, 2025

• [BUG]: This PR addresses recurring C4819 compiler warnings on Windows when using pybind11 with non-Unicode code pages (e.g., CP936):

  triage
  pybind/pybind11#5863 · Filter by author bienanguo opened on Oct 12, 2025

• [BUG]: pybind11 3.0.0 uses deprecated numpy.bool dtype

  triage
  pybind/pybind11#5847 · Filter by author dyollb opened on Sep 23, 2025
  1