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Fencer Vulns
medium 6.1

CVE-2026-59890 json

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

published 2026-07-08 4 mo ago modified 2026-10-25 14 d ago also BIT-setuptools-2026-59890 , EUVD-2026-42323 , GHSA-h35f-9h28-mq5c , PYSEC-2026-3447

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

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.

Patch / fix

  • pypi setuptools 83.0.0
  • bitnami setuptools 83.0.0
  • python setuptools 83.0.0
  • python-setuptools hummingbird 1 83.0.0-4.hum1
  • python3-setuptools hummingbird 1 83.0.0-4.hum1
  • python-setuptools-wheel hummingbird 1 83.0.0-4.hum1

red hat advisories RHSA-2026:37530

  • python-setuptools Azure Linux 3.0 69.0.3-6

azure linux advisories AZL-92229

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-59890 updated cvss 6.1

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

  • Red Hat Hardened Images python-setuptools 83.0.0-4.hum1, python3-setuptools 83.0.0-4.hum1, python-setuptools-wheel 83.0.0-4.hum1
    fixed: vendor fix RHSA-2026:37530
  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/lightspeed-stack-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-rhel9-operator, mta/mta-solution-server-rhel9 Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-rhel9-operator, migration-toolkit-virtualization/mtv-rhel9-operator, migration-toolkit-virtualization/mtv-rhv-populator-rhel8, migration-toolkit-virtualization/mtv-deep-inspection-rhel9, migration-toolkit-virtualization/mtv-deep-inspection-rhel10 Red Hat Network Observability Operator network-observability/network-observability-operator-bundle Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9, openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9
    +12 more products
    Red Hat OpenShift Service Mesh 3 openshift-service-mesh/kiali-rhel9-operator Red Hat AI Inference Server rhaii/vllm-cpu-rhel9, rhaii/vllm-tpu-rhel9, rhaii/vllm-cuda-rhel9, rhaii/vllm-rocm-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, +9 more Red Hat Ansible Automation Platform 2 automation-controller, ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9, ansible-automation-platform-26/mcp-tools-rhel9, +46 more Red Hat build of Quarkus Native builder setuptools Red Hat Ceph Storage 7 rhceph/rhceph-7-rhel9 Red Hat Ceph Storage 9 rhceph/rhceph-9-rhel9 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat Enterprise Linux 7 python-pip, python3-pip Red Hat Enterprise Linux 8 python-pip, python3-pip, fence-agents, ubi8/toolbox, python3.12-pip, ubi8/python-36, +55 more Red Hat Enterprise Linux 9 ubi9, python-pip, python3-pip, ubi9/toolbox, ubi9/ubi-stig, python3.12-pip, +16 more Red Hat Enterprise Linux 10 python-pip, rhel10/rteval, python3.14-pip, rhel10/rhel-bootc, rhel10/support-tools, rhel10-eus/rhel-10.0-bootc, +1 more Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9, +1 more
    not affected: vulnerable code not present
  • Red Hat Hardened Images harfbuzz 14.2.1-4.hum1, qt6-qtbase 6.11.1-4.hum1, python3-mypy 1.18.2-5.hum1, python-sentry-sdk 2.48.0-6.hum1, python-cryptography 48.0.0-3.hum1
    not affected: component not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-mlflow-rhel9, rhoai/odh-autorag-rhel9, rhoai/odh-mlserver-rhel9, rhoai/odh-caikit-nlp-rhel9, rhoai/odh-vllm-gaudi-rhel9, +48 more Red Hat OpenShift Container Platform 4 openshift4/dpdk-base-rhel8 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/devspaces-operator-bundle Red Hat OpenShift Virtualization 4 container-native-virtualization/virt-launcher-rhel9, container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9 Red Hat Satellite 6 satellite/iop-vmaas-rhel9, satellite/iop-puptoo-rhel9, satellite/iop-yuptoo-rhel9, satellite/iop-advisor-engine-rhel9, satellite/iop-host-inventory-rhel9, satellite/iop-advisor-backend-rhel9, +2 more
    +3 more products
    Red Hat Trusted Artifact Signer rhtas/segment-reporting-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/bootc-automation-portal-rhel9 Red Hat Service Telemetry Framework 1.5 stf/smart-gateway-rhel9-operator, stf/prometheus-webhook-snmp-rhel9, stf/service-telemetry-rhel9-operator
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/pypa/setuptools/security/advisories/GHSA-h35f-9h28-mq5c referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
OSV 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi setuptools
<83.0.0
83.0.0
bitnami setuptools
<83.0.0
83.0.0

Affected products

  • pypa setuptools

Classification

Weakness
  • CWE-176 Improper Handling of Unicode Encoding
  • CWE-697 Incorrect Comparison

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.