Python 3.14.8

Release date: Sept. 30, 2026

This is the eighth maintenance release of Python 3.14

Python 3.14.8 is an expedited security release and the eighth maintenance release of 3.14, containing around 354 bugfixes, build improvements and documentation changes from 142 contributors since 3.14.7.

Security content in this releases

• CVE-2026-19445 gh-156293 Use-after-free of a server-side SSLContext when sni_callback switches contexts

• CVE-2026-19553 gh-156793 SSLContext.wrap_bio() missing validation of server_hostname parameter

• CVE-2026-82049 gh-157190 tarfile extraction filters allow file modification and content disclosure via hard link to symlink

• CVE-2026-15310 gh-156002 Memory exhaustion in zipfile in bzip2/LZMA/Zstandard decompression

• CVE-2026-19672 gh-155999 tarfile extraction filter bypass allows creation of directories outside the destination

• CVE-2026-15806 gh-155694 urllib.request.HTTPPasswordMgr credentials for one URL scheme sent over another scheme

• CVE-2026-17084 gh-155292 StringPrep algorithm considered Unicode codepoint attributes outside Unicode 3.2.0

• gh-158446 Reject float format precision near INT_MAX

• gh-157953 Update bundled Expat to 2.8.5

• gh-158010 Update bundled OpenSSL to 3.5.9 for Windows, macOS, Android and iOS

Major new features of the 3.14 series, compared to 3.13

Some of the major new features and changes in Python 3.14 are:

New features

• PEP 779: Free-threaded Python is officially supported
• PEP 649: The evaluation of annotations is now deferred, improving the semantics of using annotations.
• PEP 750: Template string literals (t-strings) for custom string processing, using the familiar syntax of f-strings.
• PEP 734: Multiple interpreters in the stdlib.
• PEP 784: A new module compression.zstd providing support for the Zstandard compression algorithm.
• PEP 758: except and except* expressions may now omit the brackets.
• Syntax highlighting in PyREPL, and support for color in unittest, argparse, json and calendar CLIs.
• PEP 768: A zero-overhead external debugger interface for CPython.
• UUID versions 6-8 are now supported by the uuid module, and generation of versions 3-5 are up to 40% faster.
• PEP 765: Disallow return/break/continue that exit a finally block.
• PEP 741: An improved C API for configuring Python.
• A new type of interpreter. For certain newer compilers, this interpreter provides significantly better performance. Opt-in for now, requires building from source.
• Improved error messages.
• Builtin implementation of HMAC with formally verified code from the HACL* project.
• A new command-line interface to inspect running Python processes using asynchronous tasks.
• The pdb module now supports remote attaching to a running Python process.

For more details on the changes to Python 3.14, see What’s new in Python 3.14.

Build changes

• PEP 761: Python 3.14 and onwards no longer provides PGP signatures for release artifacts. Instead, Sigstore is recommended for verifiers.
• Official macOS and Windows release binaries include an experimental JIT compiler.
• Official Android binary releases are now available.

Incompatible changes, removals and new deprecations

• Incompatible changes
• Python removals and deprecations
• C API removals and deprecations
• Overview of all pending deprecations

Python install manager

The installer we offer for Windows is being replaced by our new install manager, which can be installed from the Windows Store or from its download page. See our documentation for more information. The JSON file available for download contains the list of all the installable packages available as part of this release, including file URLs and hashes, but is not required to install the latest release. The traditional installer will remain available throughout the 3.14 and 3.15 releases.

More resources

• Online documentation
• PEP 745, 3.14 Release Schedule
• Report bugs at github.com/python/cpython/issues
• Help fund Python directly (or via GitHub Sponsors) and support the Python community

Stay safe and upgrade!

As always, upgrading is highly recommended to all users of affected versions.

Enjoy the new releases

Thanks to all of the many volunteers who help make Python development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organisation contributions to the Python Software Foundation.

Full Changelog