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Module names containing null bytes bypass the sys.modules cache

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

Status: Open.

#150633 In python/cpython;

· KowalskiThomas opened on May 30, 2026

Clarify that format strings accept arbitrary tokens as field names

docsDocumentation in the Doc dirDocumentation in the Doc dir

Status: Open.

#150626 In python/cpython;

· lgalfaso opened on May 30, 2026

asyncio.protocols._feed_data_to_buffered_proto: avoid O(N^2) bytes slicing

performancePerformance or resource usagePerformance or resource usage

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

topic-asyncio

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#150621 In python/cpython;

· deadlovelll opened on May 30, 2026

Use windows-2025 in Github Actions

infraCI, GitHub Actions, buildbots, Dependabot, etc.CI, GitHub Actions, buildbots, Dependabot, etc.

OS-windows

Status: Open.

#150605 In python/cpython;

· chris-eibl opened on May 30, 2026

Stack buffer overflow in bz2 when reusing BZ2Decompressor after error

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.

#150599 In python/cpython;

· StanFromIreland opened on May 30, 2026

compression.zstd: non-determinist with zstd_dict

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.

#150583 In python/cpython;

· Rogdham opened on May 29, 2026

Replace ctypes based Windows console calls in _pyrepl

OS-windows

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

topic-replRelated to the interactive shellRelated to the interactive shell

type-refactorCode refactoring (with no changes in behavior)Code refactoring (with no changes in behavior)

Status: Open.

#150582 In python/cpython;

· aisk opened on May 29, 2026

3.15: Lazy imports break with __getattr__ (concurrent.futures)

pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

topic-lazy-imports

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

Status: Open.

#150579 In python/cpython;

· henryiii opened on May 29, 2026

SSL IntFlag enums VerifyFlags and Options are not continuous and contain "false" aliases

pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

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

topic-SSL

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

Status: Open.

#150577 In python/cpython;

· jbdyn opened on May 29, 2026

Recommend closing resolved or non-actionable issues (oldest-first batch, 2004–2007)

infraCI, GitHub Actions, buildbots, Dependabot, etc.CI, GitHub Actions, buildbots, Dependabot, etc.

Status: Open.

#150566 In python/cpython;

· citadelgrad opened on May 28, 2026

Add additional test coverage for lazy imports

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

topic-lazy-imports

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#150565 In python/cpython;

· brittanyrey opened on May 28, 2026

ntpath.ismount() returns True for a UNC server with no share (e.g. \\server, \\?\UNC\server)

OS-windows

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

Status: Open.

#150557 In python/cpython;

· amruthamodela06 opened on May 28, 2026