pybind/pybind11: Version 3.0.3

Published March 31, 2026 | Version v3.0.3

Software Open

Bug fixes:

Fixed TSS key exhaustion in implicitly_convertible() when many implicit conversions are registered across large module sets. #6020
Fixed heap-buffer-overflow in pythonbuf with undersized buffers by enforcing a minimum buffer size. #6019
Fixed virtual-inheritance pointer offset crashes when dispatching inherited methods through virtual bases. #6017
Fixed free(): invalid pointer crashes during interpreter shutdown with py::enum_<> by duplicating late-added def_property_static argument strings. #6015
Fixed function_record heap-type deallocation to call PyObject_Free() and decref the type. #6010
Hardened PYBIND11_MODULE_PYINIT and get_internals() against module-initialization crashes. #6018
Fixed static_pointer_cast build failure with virtual inheritance in holder_caster_foreign_helpers.h. #6014
Fixed ambiguous factory template specialization that caused compilation failures with nvcc + GCC 14. #6011
Fixed crash in def_readwrite for non-smart-holder properties of smart-holder classes. #6008
Fixed memory leak for py::dynamic_attr() objects on Python 3.13+ by clearing managed __dict__ contents during deallocation. #5999
Fixed binding of noexcept and ref-qualified (&, &&) methods inherited from unregistered base classes. #5992

Internal:

Moved tomlkit dependency to the dev dependency group. #5990
Switched to newer public CPython APIs (PyType_GetFlags and public vectorcall APIs where available). #6005

Tests:

Made an async callback test deterministic by replacing fixed sleep with bounded waiting. #5986

CI:

Files

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pybind/pybind11-v3.0.3.zip md5:e49833cffbe45c6687c6dbd36224bff0	1.1 MB	Preview Download

Is supplement to: Software: https://github.com/pybind/pybind11/tree/v3.0.3 (URL)