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marshal.loads() raises SystemError instead of ValueError on an invalid code object

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

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

Status: Open.

#151830 In python/cpython;

· tonghuaroot opened on Jun 21, 2026

Runaway memory use when repeatedly printing empty string

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

topic-IO

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

Status: Open.

#151814 In python/cpython;

· pastries-yay opened on Jun 20, 2026

Add curses state-query functions: is_keypad, is_cbreak, getparent, etc.

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151776 In python/cpython;

· serhiy-storchaka opened on Jun 20, 2026

Add curses dynamic color-pair functions: alloc_pair, find_pair, free_pair, reset_color_pairs

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151774 In python/cpython;

· serhiy-storchaka opened on Jun 20, 2026

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)

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

Race condition in FileIO under free-threading

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

topic-IO

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

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

Data race between resize_buffer_lock_held and _Py_DecRefShared on a shared BytesIO buffer

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

topic-free-threading

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

Status: Open.

#151640 In python/cpython;

· Naserume opened on Jun 18, 2026

Concurrent calls to Counter.update can cause a use after free

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

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.

#151633 In python/cpython;

· KowalskiThomas opened on Jun 18, 2026

_remote_debugging frame cache can reuse stale frame anchors

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

topic-profiling

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

Status: Open.

#151613 In python/cpython;

· pablogsal opened on Jun 17, 2026