CVE-2026-59890

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

State: Published
Severity: 6.1 Medium
Published: Jul 8, 2026
Updated: Jul 8, 2026
Reserved: Jul 7, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N	GitHub_M

Weaknesses

CWE-176 Improper Handling of Unicode Encoding
CWE-697 Incorrect Comparison

Affected Products

Product	Versions
setuptoolspypa	< 83.0.0Affected

References

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