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Backport CVE-47273 fix from 78.1.1 to 75.3.2 #5100

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Backport CVE-47273 fix from 78.1.1 to 75.3.2 #5100

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4 changes: 4 additions & 0 deletions setuptools/package_index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -822,6 +822,10 @@ def _download_url(self, url, tmpdir):

filename = os.path.join(tmpdir, name)

# ensure path resolves within the tmpdir
if not filename.startswith(str(tmpdir)):
raise ValueError(f"Invalid filename {filename}")

return self._download_vcs(url, filename) or self._download_other(url, filename)

@staticmethod
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