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

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Summary

CVECVE-2026-59890
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 17:17:27 UTC
Updated2026-07-10 19:01:16 UTC
Descriptionsetuptools 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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

EPSS: 0.002690000 probability, percentile 0.185990000 (date 2026-07-12)

Problem Types: CWE-176 | CWE-697 | CWE-176 CWE-176: Improper Handling of Unicode Encoding | CWE-697 CWE-697: Incorrect Comparison

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pypa Setuptools affected < 83.0.0 Not specified

References

ReferenceSourceLinkTags
github.com/pypa/setuptools/commit/dd9f436a36486b4cb8a4c70a2321548b0be09b8f [email protected] github.com
github.com/pypa/setuptools/releases/tag/v83.0.0 [email protected] github.com
github.com/pypa/setuptools/security/advisories/GHSA-h35f-9h28-mq5c 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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