EUVD-2026-42323Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
AC:H reflects three required preconditions (macOS APFS/HFS+, NFD-normalized filename, active MANIFEST.in exclusion rule); no availability impact applies.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 42,957 pypi packages depend on setuptools (10,600 direct, 33,263 indirect)
Ecosystem-wide dependent count for version 83.0.0.
DescriptionCVE.org
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.
AnalysisAI
Setuptools prior to 83.0.0 fails to normalize Unicode filenames before matching them against MANIFEST.in exclusion patterns on macOS APFS and HFS+ filesystems, allowing files with NFD-normalized on-disk names to silently bypass NFC-encoded exclude, global-exclude, recursive-exclude, and prune directives and be packed into Python source distributions. Python package maintainers developing on macOS face a supply chain risk: sensitive files such as credentials, private keys, or environment configs that are correctly listed in MANIFEST.in for exclusion may still appear in tarballs published to PyPI or private registries. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following conditions simultaneously: (1) the build machine must be macOS with an APFS or HFS+ filesystem, where filenames can be stored in NFD Unicode form; (2) at least one file in the project directory must have an NFD-normalized on-disk filename, which typically occurs when filenames contain accented characters such as é, ñ, ü, or other composed Unicode glyphs; (3) a MANIFEST.in file must contain an exclude, global-exclude, recursive-exclude, or prune directive targeting that file, written in NFC encoding; (4) the developer must actively run a setuptools-based sdist build (UI:R per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 6.1 Medium vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N accurately places the attack vector as local and requires user interaction (running the build command), reflecting that this is not a network-exploitable flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A Python developer on macOS with APFS creates a project that includes a file such as `config_café.env` whose filename is stored in NFD form by the filesystem after being created via Finder or certain shell operations. The developer adds `exclude config_café.env` to MANIFEST.in using NFC encoding as produced by their text editor, intending to prevent publication of the file. … |
| Remediation | Upgrade setuptools to version 83.0.0 or later, which normalizes Unicode filenames before applying MANIFEST.in glob exclusions. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-176 – Improper Handling of Unicode Encoding
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today