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[3.9] bpo-43882 - Mention urllib.parse changes in Whats new section. #26276

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orsenthil merged 2 commits into from
May 21, 2021
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[3.9] bpo-43882 - Mention urllib.parse changes in Whats new section. #26276

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[3.9] bpo-43882 - Mention urllib.parse changes in Whats new section.
orsenthil May 21, 2021
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Add the missing section.
orsenthil May 21, 2021
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[3.9] bpo-43882 - Mention urllib.parse changes in Whats new section.
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@orsenthil
orsenthil committed May 21, 2021
commit aec8115a1f6b0a4bb662072053dc7a7e90f35962
11 changes: 11 additions & 0 deletions Doc/whatsnew/3.9.rst
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Expand Up @@ -1560,3 +1560,14 @@ 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`)

Notable changes in Python 3.9.5
===============================

The presence of newline or tab characters in parts of a URL allows for some
forms of attacks. Following the WHATWG specification that updates :rfc:`3986`,
ASCII newline ``\n``, ``\r`` and tab ``\t`` characters are stripped from the
URL by the parser in :mod:`urllib.parse` preventing such attacks. The removal
characters are controlled by a new module level variable
``urllib.parse._UNSAFE_URL_BYTES_TO_REMOVE``. (See :issue:`43882`)