[3.1.x] Fixed #32713, Fixed CVE-2021-32052 -- Prevented newlines and tabs from being accepted in URLValidator on Python 3.9.5+.

In Python 3.9.5+ urllib.parse() automatically removes ASCII newlines
and tabs from URLs [1, 2]. Unfortunately it created an issue in
the URLValidator. URLValidator uses urllib.urlsplit() and
urllib.urlunsplit() for creating a URL variant with Punycode which no
longer contains newlines and tabs in Python 3.9.5+. As a consequence,
the regular expression matched the URL (without unsafe characters) and
the source value (with unsafe characters) was considered valid.

[1] https://bugs.python.org/issue43882 and
[2] https://github.com/python/cpython/commit/76cd81d60310d65d01f9d7b48a8985d8ab89c8b4

Backport of e1e81aa1c4427411e3c68facdd761229ffea6f6f from main.

0 files changed, 0 insertions, 0 deletions