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ZipFile.extractall happily overwrites any file on the filesystem. One
can put files with a name like "//etc/password" in a zip file and
extractall will overwrite /etc/password (with sufficient rights).
The docs say:
ZipFile.extractall([path[, members[, pwd]]])
 Extract all members from the archive to the current working
directory. path specifies a different directory to extract to. members
is optional and must be a subset of the list returned by namelist(). pwd
is the password used for encrypted files.
I read that as: it will put all files into path or a subdirectory.
Using names like "../../../etc/password" also leads to files being
written outside that path directory.