https://github.com/python/cpython/commit/634da2de88af06eb8c6ebdb90d8c0000584... commit: 634da2de88af06eb8c6ebdb90d8c00005847063d branch: 3.8 author: Senthil Kumaran <senthil@python.org> committer: ambv <lukasz@langa.pl> date: 2021-06-28T12:05:21+02:00 summary: [3.8] bpo-43882 - Mention urllib.parse changes in Whats new section. (#26277) files: M Doc/whatsnew/3.8.rst diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst index 6c30ac183b67fd..109a06e92efb7d 100644 --- a/Doc/whatsnew/3.8.rst +++ b/Doc/whatsnew/3.8.rst @@ -2294,4 +2294,16 @@ for and build on the oldest version in the range. with fixes by FX Coudert and Eli Rykoff, and backported to 3.8 by Maxime Bélanger and Ned Deily) +Notable changes in Python 3.8.10 +================================ + +urllib.parse +------------ + +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`)