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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

Fix test_faulthandler on UBSan

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

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

Status: Open.

#151278 In python/cpython;

· vstinner opened on Jun 10, 2026

TSan detects a data race when running test_ssl.test_sni_callback_race() on Free Threading

topic-free-threading

topic-SSL

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

Status: Open.

#151277 In python/cpython;

· vstinner opened on Jun 10, 2026

OR and AND documentation incomplete

docsDocumentation in the Doc dirDocumentation in the Doc dir

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

Status: Open.

#151276 In python/cpython;

· harelGrinzaid opened on Jun 10, 2026

Dump the path configuration at Python startup if import encodings fails

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

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

Status: Open.

#151253 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

Data race in weakref.getweakrefs() under free-threading

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.

#151223 In python/cpython;

· Naserume opened on Jun 10, 2026

plistlib raises a confusing TypeError when loading a partial ISO 8601 date

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

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

Status: Open.

#151221 In python/cpython;

· JavaZeroo opened on Jun 10, 2026

Data race in sys_set_flag when sys.set_int_max_str_digits() is called concurrently with free-threaded build

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.

#151218 In python/cpython;

· Naserume opened on Jun 10, 2026

Document asyncio debugging tools

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

docsDocumentation in the Doc dirDocumentation in the Doc dir

topic-asyncio

Status: Open.

#151213 In python/cpython;

· johnslavik opened on Jun 9, 2026