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gh-123299: Update 'What's New in Python 3.14' from 3.14 branch #135616

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gh-123299: Update 'What's New in Python 3.14' from 3.14 branch #135616

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35 changes: 34 additions & 1 deletion Doc/whatsnew/3.14.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1757,6 +1757,16 @@ os
(Contributed by Cody Maloney in :gh:`129205`.)


os.path
-------

* The *strict* parameter to :func:`os.path.realpath` accepts a new value,
:data:`os.path.ALLOW_MISSING`.
If used, errors other than :exc:`FileNotFoundError` will be re-raised;
the resulting path can be missing but it will be free of symlinks.
(Contributed by Petr Viktorin for :cve:`2025-4517`.)


pathlib
-------

Expand Down Expand Up @@ -1945,6 +1955,28 @@ sysconfig
(Contributed by Xuehai Pan in :gh:`131799`.)


tarfile
-------

* :func:`~tarfile.data_filter` now normalizes symbolic link targets in order to
avoid path traversal attacks.
(Contributed by Petr Viktorin in :gh:`127987` and :cve:`2025-4138`.)
* :func:`~tarfile.TarFile.extractall` now skips fixing up directory attributes
when a directory was removed or replaced by another kind of file.
(Contributed by Petr Viktorin in :gh:`127987` and :cve:`2024-12718`.)
* :func:`~tarfile.TarFile.extract` and :func:`~tarfile.TarFile.extractall`
now (re-)apply the extraction filter when substituting a link (hard or
symbolic) with a copy of another archive member, and when fixing up
directory attributes.
The former raises a new exception, :exc:`~tarfile.LinkFallbackError`.
(Contributed by Petr Viktorin for :cve:`2025-4330` and :cve:`2024-12718`.)
* :func:`~tarfile.TarFile.extract` and :func:`~tarfile.TarFile.extractall`
no longer extract rejected members when
:func:`~tarfile.TarFile.errorlevel` is zero.
(Contributed by Matt Prodani and Petr Viktorin in :gh:`112887`
and :cve:`2025-4435`.)


threading
---------

Expand Down Expand Up @@ -2700,6 +2732,7 @@ New features
* :c:func:`PyUnicodeWriter_Discard`
* :c:func:`PyUnicodeWriter_Finish`
* :c:func:`PyUnicodeWriter_Format`
* :c:func:`PyUnicodeWriter_WriteASCII`
* :c:func:`PyUnicodeWriter_WriteChar`
* :c:func:`PyUnicodeWriter_WriteRepr`
* :c:func:`PyUnicodeWriter_WriteStr`
Expand Down Expand Up @@ -2976,7 +3009,7 @@ Deprecated
:c:func:`PyUnicodeWriter_WriteSubstring(writer, str, start, end) <PyUnicodeWriter_WriteSubstring>`.
* :c:func:`!_PyUnicodeWriter_WriteASCIIString`:
replace ``_PyUnicodeWriter_WriteASCIIString(&writer, str)`` with
:c:func:`PyUnicodeWriter_WriteUTF8(writer, str) <PyUnicodeWriter_WriteUTF8>`.
:c:func:`PyUnicodeWriter_WriteASCII(writer, str) <PyUnicodeWriter_WriteASCII>`.
* :c:func:`!_PyUnicodeWriter_WriteLatin1String`:
replace ``_PyUnicodeWriter_WriteLatin1String(&writer, str)`` with
:c:func:`PyUnicodeWriter_WriteUTF8(writer, str) <PyUnicodeWriter_WriteUTF8>`.
Expand Down
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