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.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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.
Is CVE-2026-59890 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59890 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-59890?
Upgrade to a fixed release named by Red Hat:
- 83.0.0
- python-setuptools-main-83.0.0-4.hum1
- RHSA-2026:37530
Confirm against the vendor advisory before you patch.
- < 83.0.0
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
- 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
- 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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