Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

IMO it does qualify as a security issue. In case of urllib to be lenient and 
can be exploited it's good to document like tarfile and xml modules that have a 
warning about untrusted data potentially causing issues and perhaps link to a 
url validator that adheres to RFC in pypi. I would expect stdlib to handle this 
but in case it's not handled due to backwards compatibility and potential 
regressions a warning could be made about the same in the docs noting down the 
responsibility of the functions and that they are not always safe against 
malicious data.

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<https://bugs.python.org/issue30458>
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