pybind/pybind11

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Seamless operability between C++11 and Python

Stars: 18k
Forks: 2.3k
Open beginner issues: 1
Indexed issues: 574
Avg merge: 5d 17h
Merged PRs (30d): 10

Dominant language: C++
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

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574 open issues indexed

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

triage

Difficulty 5/5 Over a week Newbie friendliness 35/100

pybind/pybind11#6179 · Opened Sep 16, 2026
[BUG]: Constructor for type_caster<std::vector<std::shared_ptr<T>>> Never Called Open

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Difficulty 5/5 Over a week Newbie friendliness 30/100

pybind/pybind11#6178 · 1 comment · Opened Sep 14, 2026
[BUG]: Intermittent null internals_pp_manager::get_pp() during concurrent subinterpreter imports on Windows Open

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Difficulty 5/5 Over a week Newbie friendliness 35/100

pybind/pybind11#6174 · 1 comment · Opened Sep 12, 2026
[BUG]: missing changelog for 3.1.0 on readthedocs Open

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Difficulty 1/5 Under an hour Newbie friendliness 78/100

pybind/pybind11#6168 · Opened Sep 3, 2026
[BUG]: -Wmaybe-uninitialized warnings in O3 optimization Open

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Difficulty 3/5 1-2 days Newbie friendliness 50/100

pybind/pybind11#6167 · Opened Sep 2, 2026
Fable 5.1 review of pybind11 Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

pybind/pybind11#6159 · 3 comments · Opened Sep 1, 2026
[BUG]: `cast_error` using `PYBIND11_OVERRIDE` with implicitly converted opaque vectors Open

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Difficulty 4/5 3-5 days Newbie friendliness 45/100

pybind/pybind11#6080 · Opened Jun 3, 2026
Untrusted impersonation of the project at pybind11.com Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pybind/pybind11#6076 · Opened May 23, 2026
Collecting subinterpreter-related CI flakes Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pybind/pybind11#6071 · 3 comments · Opened May 18, 2026
[BUG]: cmake: pybind11::embed target doesn't link to Python libs if find_package(Python) has been called previously Open

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Difficulty 3/5 1-2 days Newbie friendliness 74/100

pybind/pybind11#6063 · Opened May 14, 2026
[BUG]: Document MSVC `std::mutex` ABI hazard with older `msvcp140.dll` and `_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR` Open

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Difficulty 2/5 1-3 hours Newbie friendliness 68/100

pybind/pybind11#6053 · Opened May 4, 2026
[BUG]: nullptr dereference in create_pp_content_once (internals.h) Open

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Difficulty 4/5 3-5 days Newbie friendliness 48/100

pybind/pybind11#6046 · Opened Apr 30, 2026
[BUG]: 5 tests fail Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#6037 · Opened Apr 14, 2026
[BUG]: "Already defined" import error when reusing a value name in different enums Open

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Difficulty 3/5 1-2 days Newbie friendliness 55/100

pybind/pybind11#6031 · 1 reaction · Opened Apr 7, 2026
[BUG]: Objects created using __new__ are not registered for casting Open

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Difficulty 4/5 3-5 days Newbie friendliness 45/100

pybind/pybind11#6025 · Opened Mar 30, 2026
[BUG]: std::move_constructible and pybind11::detail::is_move_constructible differ Open

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Difficulty 3/5 1-2 days Newbie friendliness 42/100

pybind/pybind11#5983 · 1 comment · Opened Feb 8, 2026
[BUG]: Hijacked domain is confusing Open

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Difficulty 4/5 3-5 days Newbie friendliness 25/100

pybind/pybind11#5963 · Opened Jan 18, 2026
[BUG]: Security link goes nowhere Open

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Difficulty 2/5 Under an hour Newbie friendliness 45/100

pybind/pybind11#5962 · Opened Jan 18, 2026
[BUG]: Compilation failure with MSVC 17.12 (v14.44) and C++20: '_BACKUP_ITERATOR_DEBUG_LEVEL' undeclared Open

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Difficulty 4/5 3-5 days Newbie friendliness 38/100

pybind/pybind11#5956 · Opened Jan 9, 2026
[BUG]: Cross compilation (x86_64-linux -> armv7l) fails with LONG_BIT related errors Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5945 · Opened Dec 24, 2025
[BUG]: CMake add_subdirectory() interference from system-installed pybind11 Open

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Difficulty 4/5 3-5 days Newbie friendliness 55/100

pybind/pybind11#5937 · 1 comment · Opened Dec 15, 2025
[BUG]: Compatibility issues between pybind11 and Py_LIMITED_API. Open

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Difficulty 4/5 3-5 days Newbie friendliness 28/100

pybind/pybind11#5905 · 1 comment · Opened Nov 26, 2025
[BUG]: integral caster inconsistencies Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5895 · Opened Nov 12, 2025
[BUG]: py::py::mod_gil_not_used() maybe not support python 3.14.0 free threaded feature, when using callback function Open

triage

Difficulty 4/5 3-5 days Newbie friendliness 30/100

pybind/pybind11#5894 · Opened Nov 12, 2025
[BUG]: Is Pybind11 cmake work for Windows py3.14t if only set `PYTHON_EXECUTABLE`? Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5884 · 1 comment · 2 reactions · Opened Oct 27, 2025
[BUG]: KeysView/ItemsView does not support set operations Open

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Difficulty 3/5 1-2 days Newbie friendliness 48/100

pybind/pybind11#5876 · Opened Oct 21, 2025
[BUG]: 5 tests fail on FreeBSD Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5872 · Opened Oct 15, 2025
[BUG]: This PR addresses recurring C4819 compiler warnings on Windows when using pybind11 with non-Unicode code pages (e.g., CP936): Open

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Difficulty 2/5 1-3 hours Newbie friendliness 55/100

pybind/pybind11#5863 · Opened Oct 12, 2025
[BUG]: Misleading errors on duplicate enum key registration Open

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Difficulty 3/5 1-2 days Newbie friendliness 38/100

pybind/pybind11#5853 · Opened Oct 1, 2025
[BUG]: pybind11 3.0.0 uses deprecated numpy.bool dtype Open

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Difficulty 2/5 1-3 hours Newbie friendliness 45/100

pybind/pybind11#5847 · 1 comment · Opened Sep 23, 2025
[BUG]: If indicies of scipy.csc_matrix are not sorted conversion to Eigen::SparseMatrix Fails in debug mode. Open

triage

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pybind/pybind11#5819 · Opened Sep 1, 2025
[BUG]: Python_ADD_LIBRARY: target Python::Module not defined Open

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Difficulty 4/5 3-5 days Newbie friendliness 45/100

pybind/pybind11#5813 · 1 comment · 1 reaction · Opened Aug 24, 2025
[BUG]: Can't use PYBIND11_NUMPY_DTYPE with subinterpreters Open

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Difficulty 4/5 3-5 days Newbie friendliness 25/100

pybind/pybind11#5781 · Opened Jul 31, 2025
[FEA]: change function __qualname__ prefix Open

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Difficulty 3/5 1-2 days Newbie friendliness 45/100

pybind/pybind11#5774 · 13 comments · Opened Jul 28, 2025
[BUG]: Exception thrown from C++ library function could not be correctly converted to the registered class with clang-19 compiler Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5773 · 1 reaction · Opened Jul 28, 2025
[BUG]: SupportsInt and SupportsFloat changes cause type checking failures on python classes that override these functions Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5767 · 28 comments · Opened Jul 24, 2025
[BUG]: slow compile if very long std::array being used with clang-18 Open

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Difficulty 5/5 Over a week Newbie friendliness 20/100

pybind/pybind11#5765 · 1 comment · Opened Jul 24, 2025
[BUG]: writes to std::array is not working Open

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Difficulty 3/5 1-2 days Newbie friendliness 45/100

pybind/pybind11#5754 · 3 comments · Opened Jul 13, 2025
[BUG]: not able to install from source on Rocky Linux 8 Open

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Difficulty 4/5 3-5 days Newbie friendliness 25/100

pybind/pybind11#5695 · 3 comments · Opened May 25, 2025
Python Path Configuration & Abort() Error Open

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Difficulty 4/5 3-5 days Newbie friendliness 30/100

pybind/pybind11#5644 · Opened May 7, 2025
[BUG]: function with argument type `std::optional<std::reference_wrapper<Eigen::...>>` gives segmentation fault Open

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Difficulty 4/5 3-5 days Newbie friendliness 38/100

pybind/pybind11#5637 · Opened May 1, 2025
[BUG]: returning nullptr from a function supposed to return Eigen...* gives errr Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5635 · Opened May 1, 2025
[BUG]: pybind11-config sometimes give wrong result Open

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Difficulty 4/5 3-5 days Newbie friendliness 25/100

pybind/pybind11#5631 · Opened Apr 25, 2025
[BUG]: Specifying return type `Eigen::Map<...>` in `PYBIND11_OVERRIDE_PURE` gives compilation error Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5622 · Opened Apr 17, 2025
[WARING]: Compile Warning Open

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Difficulty 2/5 1-3 hours Newbie friendliness 35/100

pybind/pybind11#5610 · 1 comment · Opened Apr 10, 2025
Docs: Include mention of `std::span` in the supported type conversions page Open

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Difficulty 1/5 Under an hour Newbie friendliness 62/100

pybind/pybind11#5604 · 1 comment · Opened Apr 7, 2025
[BUG]: Missing calls from a cProfile profile when calling into a pybind11 extension Open

triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5600 · 2 comments · 2 reactions · Opened Apr 3, 2025
[BUG]: Argument conversion in dispatcher assumes sequence protocol when casting to list[<something>] Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5558 · Opened Mar 11, 2025
[BUG]: Setting the `__name__` attribute changes the behaviour of error reporting Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5551 · Opened Mar 5, 2025
[BUG]: The main repository and submodule both have source code dependencies on the usage of pybind11 Open

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Difficulty 4/5 3-5 days Newbie friendliness 35/100

pybind/pybind11#5521 · 1 comment · Opened Feb 14, 2025

pybind/pybind11

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