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

According to the Python Security Model, this issue is not security 
vulnerability:
(*) https://python-security.readthedocs.io/security.html#python-security-model

The marshal is not intended to be used to load untrusted code. That's why its 
documentation contains the red warning:
"The marshal module is not intended to be secure against erroneous or 
maliciously constructed data. Never unmarshal data received from an untrusted 
or unauthenticated source."
https://docs.python.org/dev/library/marshal.html

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<https://bugs.python.org/issue41208>
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