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bpo-43285: Add a What's New entry for 3.9.3. by gpshead · Pull Request #24887 · python/cpython · GitHub

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bpo-43285: Add a What's New entry for 3.9.3. #24887

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bpo-43285: Add a What's New entry for 3.9.3. #24887

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9 changes: 9 additions & 0 deletions Doc/whatsnew/3.9.rst
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Expand Up @@ -1450,3 +1450,12 @@ Removed
``PyNullImporter_Type``, ``PyCmpWrapper_Type``, ``PySortWrapper_Type``,
``PyNoArgsFunction``.
(Contributed by Pablo Galindo Salgado in :issue:`39372`.)

Notable changes in Python 3.9.3
===============================

A security fix alters the :class:`ftplib.FTP` behavior to not trust the
IPv4 address sent from the remote server when setting up a passive data
channel. We reuse the ftp servers IP address instead. For unusual code
requiring the old behavior, set a ``trust_server_pasv_ipv4_address``
attribute on your FTP instance to ``True``. (See :issue:`43285`)
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