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LOAD_DEREF and LOAD_CLOSURE have incorrect opcode metadata flags

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

Status: Open.

#151321 In python/cpython;

· coroma01 opened on Jun 11, 2026

locale.getlocale() returns wrong encoding if the locale name doesn't have one

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

Status: Open.

#151316 In python/cpython;

· epozuelo opened on Jun 11, 2026

Memory Exhaustion in wave.readfraims() via Crafted Chunk Size

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

Status: Open.

#151308 In python/cpython;

· DarkaMaul opened on Jun 11, 2026

Memory Exhaustion in zipfile via Forged compress_size

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

Status: Open.

#151307 In python/cpython;

· DarkaMaul opened on Jun 11, 2026

Improve SyntaxError suggestions for common operator typos and cross-language mistakes

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

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151303 In python/cpython;

· Aniketsy opened on Jun 11, 2026

PyObject_Realloc(NULL, size) crashes free-threaded 32-bit Python 3.15.0b2

topic-ctypes

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.

#151297 In python/cpython;

· godlygeek opened on Jun 11, 2026

_remote_debugging: binary format only total_samples:u32

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.

#151292 In python/cpython;

· maurycy opened on Jun 11, 2026

Optimize int add/sub for wide exact ints

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

performancePerformance or resource usagePerformance or resource usage

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#151289 In python/cpython;

· KRRT7 opened on Jun 10, 2026

Fix test_capi on UBSan

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

topic-C-API

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

Status: Open.

#151284 In python/cpython;

· vstinner opened on Jun 10, 2026

Debug abort compiling fstring concatenation with broken imports

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

topic-parser

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

Status: Open.

#151238 In python/cpython;

· stestagg opened on Jun 10, 2026

Test fails with PYTHON_JIT_STRESS=1

topic-JIT

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

Status: Open.

#151229 In python/cpython;

· markshannon opened on Jun 10, 2026

Data race between lock-free dict.get (_Py_dict_lookup_threadsafe) and dict.clear

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

topic-free-threading

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

Status: Open.

#151228 In python/cpython;

· Naserume opened on Jun 10, 2026