[3.6] bpo-43882 - Mention urllib.parse changes in Whats New section f… · python/cpython@6f743e7 (original) (raw)

Original file line number	Diff line number	Diff line change
@@ -2481,3 +2481,10 @@ IPv4 address sent from the remote server when setting up a passive data
2481	2481	channel. We reuse the ftp server IP address instead. For unusual code
2482	2482	requiring the old behavior, set a ``trust_server_pasv_ipv4_address``
2483	2483	attribute on your FTP instance to ``True``. (See :issue:`43285`)
	2484	+
	2485	+The presence of newline or tab characters in parts of a URL allows for some
	2486	+forms of attacks. Following the WHATWG specification that updates RFC 3986,
	2487	+ASCII newline ``\n``, ``\r`` and tab ``\t`` characters are stripped from the
	2488	+URL by the parser :func:`urllib.parse` preventing such attacks. The removal
	2489	+characters are controlled by a new module level variable
	2490	+``urllib.parse._UNSAFE_URL_BYTES_TO_REMOVE``. (See :issue:`43882`)