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[3.9] bpo-43285: Add a What's New entry for 3.9.3. #24888

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Merged
gpshead merged 2 commits into from
Mar 16, 2021
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[3.9] bpo-43285: Add a What's New entry for 3.9.3. #24888

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bpo-43285: Add a What's New entry for 3.9.3.
gpshead Mar 16, 2021
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typo
gpshead Mar 16, 2021
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9 changes: 9 additions & 0 deletions 9 Doc/whatsnew/3.9.rst
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Expand Up @@ -1529,3 +1529,12 @@ separator key, with ``&`` as the default. This change also affects
functions internally. For more details, please see their respective
documentation.
(Contributed by Adam Goldschmidt, Senthil Kumaran and Ken Jin in :issue:`42967`.)

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 server 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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