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CPython crashes on memory-allocation failure (OOM): 35 findings

extension-modulesC modules in the Modules dirC modules in the Modules dir

interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

topic-free-threading

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#151763 In python/cpython;

· devdanzin opened on Jun 20, 2026

Add wide-character (cchar_t) support to the curses module

3.16new features, bugs and security fixesnew features, bugs and security fixes

extension-modulesC modules in the Modules dirC modules in the Modules dir

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151757 In python/cpython;

· serhiy-storchaka opened on Jun 19, 2026

ipaddress: Two more IPv6 ranges (RFC 9602, 9780) missing from _private_networks

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#151749 In python/cpython;

· mjbommar opened on Jun 19, 2026

typing caches keep extension types alive past shutdown

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#151728 In python/cpython;

· wjakob opened on Jun 19, 2026

Data race on frozendict reads during construction in the free-threading build

Status: Open.

#151722 In python/cpython;

· tonghuaroot opened on Jun 19, 2026

Race condition in FileIO under free-threading

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Status: Open.

#151707 In python/cpython;

· KowalskiThomas opened on Jun 19, 2026

Use-after-free of the screen encoding in the _curses module

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixes

3.16new features, bugs and security fixesnew features, bugs and security fixes

extension-modulesC modules in the Modules dirC modules in the Modules dir

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#151695 In python/cpython;

· serhiy-storchaka opened on Jun 19, 2026

Standardize os result dataclass documentation

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#151684 In python/cpython;

· cmaloney opened on Jun 18, 2026

Improve test coverage of tkinter

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixes

3.16new features, bugs and security fixesnew features, bugs and security fixes

testsTests in the Lib/test dirTests in the Lib/test dir

topic-tkinter

Status: Open.

#151678 In python/cpython;

· serhiy-storchaka opened on Jun 18, 2026

Add tkinter Text methods sync() and pendingsync()

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-tkinter

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151675 In python/cpython;

· serhiy-storchaka opened on Jun 18, 2026

Add tkinter Text methods edit_canundo() and edit_canredo()

stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

topic-tkinter

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151674 In python/cpython;

· serhiy-storchaka opened on Jun 18, 2026

Segfault: Py_DECREF(NULL) in setup_context/do_warn (_warnings.c) when emitting a warning under MemoryError

extension-modulesC modules in the Modules dirC modules in the Modules dir

type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Status: Open.

#151673 In python/cpython;

· devdanzin opened on Jun 18, 2026