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Add support for OpenSSL 4.0.0 final

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

topic-SSL

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#148600 In python/cpython;

· vstinner opened on Apr 15, 2026

ssl.SSLSocket.read() / write() missing ERR_clear_error() before SSL_read_ex() / SSL_write_ex() causes spurious errors with cooperative threading

3.13bugs and security fixesbugs and security fixes

3.14bugs and security fixesbugs and security fixes

3.15new features, bugs and security fixesnew features, bugs and security fixes

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

topic-SSL

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

Status: Open.

#148594 In python/cpython;

· kswia opened on Apr 15, 2026

3.15.0a8 fails test_urllib2_localnet with OpenSSL 4.0.0beta1

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

topic-SSL

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

Status: Open.

#148292 In python/cpython;

· hroncok opened on Apr 9, 2026

Update OpenSSL (January 2026)

dependenciesPull requests that update a dependency filePull requests that update a dependency file

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

OS-android

OS-ios

OS-mac

OS-windows

topic-SSL

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#144551 In python/cpython;

· hugovk opened on Feb 6, 2026

Data races in OpenSSL bindings

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

topic-SSL

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

Status: Open.

#143756 In python/cpython;

· colesbury opened on Jan 12, 2026

Use OpenSSL instrumented with TSan for TSan tests

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

topic-SSL

type-featureA feature request or enhancementA feature request or enhancement

Status: Open.

#143750 In python/cpython;

· colesbury opened on Jan 12, 2026

test_ssl_in_multiple_threads is flaky due to with self.subTest with threads

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

topic-SSL

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

Status: Open.

#143443 In python/cpython;

· colesbury opened on Jan 5, 2026

Observed memory leak in ssl library: Python 3.14 GC issue

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

topic-SSL

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

Status: Open.

#142516 In python/cpython;

· HenriBlacksmith opened on Dec 10, 2025

debughelper: GIL is leaked when ssl_obj->ctx->keylog_bio == NULL

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

topic-SSL

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

Status: Open.

#142438 In python/cpython;

· LumioseSil opened on Dec 8, 2025

Use-after-free due to race between SSLContext.set_alpn_protocols and opening a connection

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

topic-SSL

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

Status: Open.

#141012 In python/cpython;

· dgrisby opened on Nov 4, 2025

performance regression in ssl module under free-threading

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

performancePerformance or resource usagePerformance or resource usage

topic-free-threading

topic-SSL

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

Status: Open.

#140795 In python/cpython;

· kumaraditya303 opened on Oct 30, 2025

ASAN: double-free in SSL handshake

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

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

topic-SSL

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

Status: Open.

#140608 In python/cpython;

· YuanchengJiang opened on Oct 26, 2025