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Public proof of conceptFix available

CVE-2026-59890

A public proof of concept exists; no exploitation attested.

  • Published2026-07-08
  • Fixed in83.0.0
  • WeaknessCWE-176 · CWE-697

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-07-0817:17CVE publishedNVD

Versions per branch

NVD · OSV
Python setuptools
BranchAffectedFixed in
83.0< 83.0.083.0.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • pypa setuptools
    Affected
    • = < 83.0.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-08

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • airflow-3Wolfiall versions · fixed in 3.3.0-r4
  • airflow-3MinimOSall versions · fixed in 3.3.1-r0
  • airflow-3CleanStartall versions · fixed in 3.0.6-r1
  • airflow-3CleanStartall versions · fixed in 3.1.8-r6
  • airflow-3CleanStartall versions · fixed in 3.2.1-r6
  • airflow-3CleanStartall versions · fixed in 3.2.2-r1
  • airflow-3Chainguardall versions · fixed in 3.3.0-r4
  • ansible-operatorChainguardall versions · fixed in 1.42.3-r9

155 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-59890 Red Hat Product Security5 products fixed

    setuptools: setuptools: MANIFEST.in exclusion bypass in sdist via Unicode normalization collision (NFC/NFD)

  • RHSA-2026:37530 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Full record on NVD

Fix

  1. Update Python setuptools to 83.0.0
  2. Vendor fix Red Hat Product Security RHSA-2026:37530 · 5 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:37530 · 5 productsMitigation 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.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Published
2026-07-08
Last Modified
2026-10-25
NVD status
Analyzed
GitHub Advisory
GHSA-h35f-9h28-mq5c

Frequently asked questions

What is CVE-2026-59890?

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.

Is CVE-2026-59890 actively exploited?

A proof-of-concept exploit exists for CVE-2026-59890, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-59890?

CVE-2026-59890 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

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