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CVE-2026-59890— setuptools: MANIFEST.in exclusion bypass in sdist via Unicode normalization collision (NFC/NFD) on macOS APFS/HFS+

Quick assessment

Affected
pypa setuptools
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Python Packaging Authority Setuptools是Python Packaging Authority组织开源的一套Python包管理工具。 Python Packaging Authority Setuptools 83.0.0之前版本存在安全漏洞，该漏洞源于Unicode归一化处理不当，可能导致在macOS APFS或HFS+上通过NFD文件名绕过NFC排除规则并打包到源代码发行版中。

CVSS 6.1 · Medium EPSS 0.40% · P35

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
pypa setuptools < 83.0.0 affected
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I. Basic Information for CVE-2026-59890

Vulnerability Information
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Vulnerability Title
setuptools: MANIFEST.in exclusion bypass in sdist via Unicode normalization collision (NFC/NFD) on macOS APFS/HFS+
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Unicode编码处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Python Packaging Authority Setuptools 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python Packaging Authority Setuptools是Python Packaging Authority组织开源的一套Python包管理工具。 Python Packaging Authority Setuptools 83.0.0之前版本存在安全漏洞，该漏洞源于Unicode归一化处理不当，可能导致在macOS APFS或HFS+上通过NFD文件名绕过NFC排除规则并打包到源代码发行版中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pypa setuptools < 83.0.0 -

II. Public POCs for CVE-2026-59890

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III. Intelligence Information for CVE-2026-59890

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Patches & Fixes for CVE-2026-59890 (1)

Vendor Advisories for CVE-2026-59890 (1)

Vendor Pages for CVE-2026-59890 (1)

IV. Related Vulnerabilities

Same product: setuptools
Same vendor: pypa
Same weakness: CWE-176