From c723d5191110f99849f7b0944820f6c3cd5f7747 Mon Sep 17 00:00:00 2001 From: Senthil Kumaran Date: Thu, 20 May 2021 13:15:01 -0700 Subject: [3.7] bpo-43882 - Mention urllib.parse changes in Whats New section for 3.7.11 (GH-26267) Co-authored-by: Gregory P. Smith --- Doc/whatsnew/3.7.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst index 85f924b..2cc380b 100644 --- a/Doc/whatsnew/3.7.rst +++ b/Doc/whatsnew/3.7.rst @@ -2594,3 +2594,13 @@ 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`) + + +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 :func:`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`) + + -- cgit v0.12