Paul Ganssle <p.gans...@gmail.com> added the comment:

Sorry you didn't receive a response to your security@ email, I guess my 
response just went to the PSRT, not to you as well. I believe we determined 
that this was an issue in importlib.resources generally, not specific to 
zoneinfo.

I think `importlib.resources.open_binary` should check if a resource is a file 
with `os.isfile` before opening it. That will solve the issue in zoneinfo and 
other similar situations.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44829>
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