Medium6.1Red Hat Linux

Medium [CVE-2026-59890] MANIFEST.in exclusion bypass in sdist via Unicode normalization collision (NFC/NFD)

This medium-severity Red Hat Linux advisory covers CVE-2026-59890 affecting Red Hat Hardened Images.

CVE-2026-59890 Published Jul 8, 2026Updated by vendor Jul 8, 2026

CVE-2026-59890

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

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. A flaw was found in setuptools, a Python package management tool.

The FileList component, responsible for handling file exclusions, did not properly normalize Unicode file names when applying exclusion rules. As a result, sensitive files that should have been excluded could be inadvertently included in a source distribution, leading to information disclosure.

Red Hat severity: Moderate — CVSS 6.1 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N). Weakness: CWE-1025.

Affected Red Hat products: Red Hat Hardened Images.

Affected versions

< 83.0.0

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions

83.0.0
python-setuptools-main-83.0.0-4.hum1
RHSA-2026:37530

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

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