Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:

Accepting binary input where only letters are expected by an application is a 
very common source of security holes.   An application that relies on 
s.isalpha() to guarantee that s does not contain non-ASCII characters when 
UTF-8 locale is in use, may have a security hole if it is ran with python 2.5.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9335>
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