Update dependency setuptools to v78 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
setuptools (changelog)	~=70.0.0 -> ~=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

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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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v75.5.0

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v75.4.0

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v75.3.2

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v75.3.1

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v75.3.0

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v75.2.0

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v75.1.0

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v75.0.0

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v74.1.3

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v74.1.2

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v74.1.1

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v74.1.0

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v74.0.0

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v73.0.1

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v73.0.0

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v72.2.0

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v72.1.0

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v72.0.0

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v71.1.0

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v71.0.4

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v71.0.3

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v71.0.2

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v71.0.1

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v71.0.0

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v70.3.0

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v70.2.0

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v70.1.1

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v70.1.0

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Configuration

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[sourcery-ai]

Reviewer's Guide

Upgrade setuptools in requirements.txt from ~=70.0.0 to ~=78.1.1 to resolve a path traversal vulnerability (CVE-2025-47273).

Sequence Diagram: CVE-2025-47273 Path Traversal Vulnerability in setuptools < 78.1.1

sequenceDiagram
    autonumber
    actor Attacker
    participant UserProcess as "User Process (using setuptools)"
    participant PackageIndex as "setuptools.PackageIndex._download_url (<78.1.1)"
    participant Utils as "Utility functions (e.g. egg_info_for_url)"
    participant OSPath as "os.path"
    participant Filesystem

    Attacker-->>UserProcess: Provides malicious URL (e.g., in package metadata or index)
    UserProcess->>+PackageIndex: Calls _download_url(malicious_url, "/intended/tmp/dir")
    PackageIndex->>+Utils: egg_info_for_url(malicious_url)
    Utils-->>-PackageIndex: Returns 'name' derived from URL (e.g., "../../../../etc/passwd" or "/etc/passwd")
    PackageIndex->>PackageIndex: Insufficient sanitization of 'name'
    PackageIndex->>+OSPath: join("/intended/tmp/dir", name)
    OSPath-->>-PackageIndex: filename (e.g., "/etc/passwd" or "/intended/tmp/dir/../../../../etc/passwd")
    Note right of OSPath: If 'name' is absolute, initial path is discarded.
    Note right of OSPath: '..' can lead to path traversal.
    PackageIndex->>+Filesystem: Writes downloaded content to 'filename'
    Filesystem-->>-PackageIndex: File written to unintended arbitrary location
    PackageIndex-->>-UserProcess: Operation completes, potentially compromising system

Loading

File-Level Changes

Change	Details	Files
Upgraded setuptools dependency version	Changed version specifier from ~=70.0.0 to ~=78.1.1	requirements.txt

Possibly linked issues

• #123: The PR updates setuptools to v78.1.1 which is listed as an update in the issue's dependency dashboard.

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