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

mediumCVSS 6.1CVE-2026-59890

CSIRTS triage

vendor: setuptoolsproduct: setuptoolsOther
What
A MANIFEST.in exclusion bypass can occur due to Unicode normalization collision on macOS APFS/HFS+.
Who is affected
Users of setuptools on macOS are affected.
Urgency
Remediation is medium urgency due to the medium severity of the issue.
Action
Update setuptools to the latest version.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.1
Published
2026-07-02
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59890

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-59890coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for setuptools

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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