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lines changed Original file line number Diff line number Diff line change @@ -1529,3 +1529,12 @@ separator key, with ``&`` as the default. This change also affects
15291529functions internally. For more details, please see their respective
15301530documentation.
15311531(Contributed by Adam Goldschmidt, Senthil Kumaran and Ken Jin in :issue: `42967 `.)
1532+
1533+ Notable changes in Python 3.9.3
1534+ ===============================
1535+
1536+ A security fix alters the :class: `ftplib.FTP ` behavior to not trust the
1537+ IPv4 address sent from the remote server when setting up a passive data
1538+ channel. We reuse the ftp server IP address instead. For unusual code
1539+ requiring the old behavior, set a ``trust_server_pasv_ipv4_address ``
1540+ attribute on your FTP instance to ``True ``. (See :issue: `43285 `)
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