STINNER Victor <vstin...@python.org> added the comment:

Lib/multiprocessing/connection.py uses a challenge to authenticate the client. 
How do you connect to the server?

Yes, it's known that pickle is not safe, there is a big red warning at the top 
of the doc:
https://docs.python.org/dev/library/pickle.html

But please elaborate your attack scenario. How do you execute arbitrary code on 
a server? How do you inject code?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40039>
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