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

Is this issue a duplicate of bpo-36260 "[security] CVE-2019-9674: Zip Bomb 
vulnerability" which has been closed by documenting the issue (without touching 
zipfile.py)?

The zipfile documentation now contains an explicit warning against ZIP bombs:

"""
Resources limitations

The lack of memory or disk volume would lead to decompression failed. For 
example, decompression bombs (aka ZIP bomb) apply to zipfile library that can 
cause disk volume exhaustion.
"""

https://docs.python.org/dev/library/zipfile.html#resources-limitations

Note: bpo-36462 "CVE-2019-9674 : zip bomb vulnerability in Lib/zipfile.py" was 
closed as duplicate of bpo-36260.

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