Update dependency setuptools to v78 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
setuptools (changelog)	==75.5.0 -> ==78.1.1

GitHub Vulnerability Alerts

CVE-2025-47273

Summary

A path traversal vulnerability in PackageIndex was fixed in setuptools version 78.1.1

Details

    def _download_url(self, url, tmpdir):
        # Determine download filename
        #
        name, _fragment = egg_info_for_url(url)
        if name:
            while '..' in name:
                name = name.replace('..', '.').replace('\\', '_')
        else:
            name = "__downloaded__"  # default if URL has no path contents

        if name.endswith('.[egg.zip](http://egg.zip/)'):
            name = name[:-4]  # strip the extra .zip before download

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

Here: https://github.com/pypa/setuptools/blob/6ead555c5fb29bc57fe6105b1bffc163f56fd558/setuptools/package_index.py#L810C1-L825C88

os.path.join() discards the first argument tmpdir if the second begins with a slash or drive letter.
name is derived from a URL without sufficient sanitization. While there is some attempt to sanitize by replacing instances of '..' with '.', it is insufficient.

Risk Assessment

As easy_install and package_index are deprecated, the exploitation surface is reduced.
However, it seems this could be exploited in a similar fashion like GHSA-r9hx-vwmv-q579, and as described by POC 4 in GHSA-cx63-2mw6-8hw5 report: via malicious URLs present on the pages of a package index.

Impact

An attacker would be allowed to write files to arbitrary locations on the filesystem with the permissions of the process running the Python code, which could escalate to RCE depending on the context.

References

https://huntr.com/bounties/d6362117-ad57-4e83-951f-b8141c6e7ca5
https://github.com/pypa/setuptools/issues/4946

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Release Notes

pypa/setuptools (setuptools)

v78.1.1

Compare Source

v78.1.0

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v78.0.2

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v78.0.1

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v77.0.3

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v77.0.1

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v76.1.0

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v76.0.0

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v75.9.1

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v75.9.0

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v75.8.2

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v75.8.1

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v75.8.0

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v75.7.0

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v75.6.0

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Configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.95%. Comparing base (106bce7) to head (028807b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #283   +/-   ##
=======================================
  Coverage   76.95%   76.95%           
=======================================
  Files          31       31           
  Lines        4530     4530           
  Branches      321      321           
=======================================
  Hits         3486     3486           
  Misses        975      975           
  Partials       69       69           

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[renovate]

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