chore(deps): Update dependency setuptools to v83 [SECURITY] - autoclosed by renovate[bot] · Pull Request #1562 · VMAFx/vmafx

renovate · 2026-09-26T18:27:42Z

This PR contains the following updates:

Package	Change	Age	Confidence
setuptools (changelog)	`>=77.0.1` → `>=83.0.0`

setuptools has a path traversal vulnerability in PackageIndex.download that leads to Arbitrary File Write

BIT-setuptools-2025-47273 / CVE-2025-47273 / GHSA-5rjg-fvgr-3xxf / PYSEC-2025-49

More information

Details

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

Severity

CVSS Score: 7.7 / 10 (High)
Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

References

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

BIT-setuptools-2025-47273 / CVE-2025-47273 / GHSA-5rjg-fvgr-3xxf / PYSEC-2025-49

More information

Details

setuptools is a package that allows users to download, build, install, upgrade, and uninstall Python packages. A path traversal vulnerability in PackageIndex is present in setuptools prior to version 78.1.1. 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 remote code execution depending on the context. Version 78.1.1 fixes the issue.

Severity

CVSS Score: 8.8 / 10 (High)
Vector String: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

This data is provided by OSV and the PyPI Advisory Database (CC-BY 4.0).

setuptools: MANIFEST.in exclusion bypass in sdist via Unicode normalization collision (NFC/NFD) on macOS APFS/HFS+

BIT-setuptools-2026-59890 / CVE-2026-59890 / GHSA-h35f-9h28-mq5c / PYSEC-2026-3447

More information

Details

Summary

When building a source distribution (python -m build --sdist / setup.py sdist), setuptools' FileList applies MANIFEST.in directives (exclude, global-exclude, recursive-exclude, prune) by matching a compiled glob against on-disk file names byte-for-byte, with no Unicode normalization. On normalization-preserving filesystems (notably macOS APFS and HFS+), a file written in NFD and a MANIFEST.in rule written in NFC refer to the same file but are byte-distinct, so the exclusion silently fails to match. A file the maintainer intended to exclude is then packed into the .tar.gz and, if published, uploaded to the public, immutable PyPI index.

Details

File names in FileList.files come from os.walk (setuptools/_distutils/filelist.py, _find_all_simple), so on APFS a file written NFD is offered to the matcher in NFD, while the MANIFEST.in pattern carries the author's editor form (typically NFC). The matching path performs no canonicalization:

##### setuptools/command/egg_info.py  (FileList.global_exclude)
def global_exclude(self, pattern):
    match = translate_pattern(os.path.join('**', pattern))   # fnmatch.translate -> regex, no NFC/NFD
    return self._remove_files(match.match)                   # byte-level regex over raw os.walk names

A rule written NFC (café = 63 61 66 c3 a9) does not match an on-disk name written NFD (café = 63 61 66 65 cc 81), even though the filesystem treats the two as one file.

A unicodedata.normalize('NFD', ...) helper exists in setuptools/unicode_utils.py (decompose()), but it is never called in the manifest matching path, so neither the pattern nor the walked path is normalized before matching. The only normalization in this area, EggInfoCommand._manifest_normalize, uses filesys_decode (bytes→str decode only, no NFC/NFD) and runs when writing SOURCES.txt, after matching has already occurred.

Impact

MANIFEST.in exclusions are the documented mechanism maintainers use to keep secrets, local configs, and private fixtures out of the published sdist. A non-ASCII excluded file may be published to the public, immutable PyPI index despite the rule — an irreversible disclosure with no visual cue (NFC and NFD forms render identically). Exposure is filesystem-dependent and most relevant on macOS APFS/HFS+, where many maintainers build and publish. Pure-ASCII rules are unaffected.

Proof of concept

With a project containing MANIFEST.in:

global-include *.txt *.json
global-exclude secret_café.txt    # rule saved NFC

and an on-disk file secret_café.txt written in NFD, python -m build --sdist packs the secret file into the resulting .tar.gz, while an ASCII control file excluded by the same directive is correctly dropped — isolating the bypass to the NFC-pattern vs. NFD-name mismatch. Reproduced on macOS APFS with setuptools 82.0.1.

Remediation

Normalize both the walked path and each MANIFEST.in pattern to a single canonical form before matching, in both setuptools/command/egg_info.py (FileList) and the vendored setuptools/_distutils/filelist.py. For an exclusion list, err toward excluding more, and document that MANIFEST.in matching is normalization-insensitive on macOS.

Credit

Reported by Tomas Illuminati. Coordinated via CERT/CC VINCE VU#604762.

Severity

CVSS Score: 6.1 / 10 (Medium)
Vector String: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

References

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

BIT-setuptools-2026-59890 / CVE-2026-59890 / GHSA-h35f-9h28-mq5c / PYSEC-2026-3447

More information

Details

setuptools is a package that allows users to download, build, install, upgrade, and uninstall Python packages. Prior to 83.0.0, FileList applied MANIFEST.in exclude, global-exclude, recursive-exclude, and prune directives by matching compiled glob patterns against on-disk file names without Unicode normalization, so on macOS APFS or HFS+ an NFD file name could bypass an NFC exclusion rule and be packed into a source distribution. This issue is fixed in version 83.0.0.

Severity

CVSS Score: 6.1 / 10 (Medium)
Vector String: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

References

This data is provided by OSV and the PyPI Advisory Database (CC-BY 4.0).

Release Notes

pypa/setuptools (setuptools)

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setuptools has a path traversal vulnerability in PackageIndex.download that leads to Arbitrary File Write

Details

Summary

Details

Risk Assessment

Impact

References

Severity

References

BIT-setuptools-2025-47273 / CVE-2025-47273 / GHSA-5rjg-fvgr-3xxf / PYSEC-2025-49

Details

Severity

References

setuptools: MANIFEST.in exclusion bypass in sdist via Unicode normalization collision (NFC/NFD) on macOS APFS/HFS+

Details

Summary

Details

Impact

Proof of concept

Remediation

Credit

Severity

References

BIT-setuptools-2026-59890 / CVE-2026-59890 / GHSA-h35f-9h28-mq5c / PYSEC-2026-3447

Details

Severity

References

Release Notes

Configuration

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renovate Bot commented Sep 26, 2026 •

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