[issue42096] zipfile.is_zipfile incorrectly identifying a gzipped file as a zip archive

[Brian Kohan]

Brian Kohan <bckohan at gmail.com> added the comment:

Hi all,

I'm experiencing the same issue. I took a look at the is_zipfile code - seems like its not checking the start of the file for the magic numbers, but looking deeper in. I presume because the magic numbers at the start are considered unreliable for some reason? Seems like this opens the check up to unlucky random false positives though.

Offending file:

https://www.dropbox.com/s/t2kafn6ek1m2huy/CHPI_Rinex.crx?dl=1

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nosy: +bckohan
versions: +Python 3.7, Python 3.8

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<https://bugs.python.org/issue42096>
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