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

CVE-2026-59890 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N. EPSS exploitation probability: 0.3%.

Is there a public PoC exploit available for CVE-2026-59890?

Yes, a public proof-of-concept exploit is available for CVE-2026-59890. Prioritise patching immediately. EPSS: 0.3%.

Is there a patch available for CVE-2026-59890?

Yes, a patch is available for CVE-2026-59890. Update the affected software to the latest version immediately.

setuptools CVE-2026-59890

EUVD-2026-42323 MEDIUM

Improper Handling of Unicode Encoding (CWE-176)

2026-07-08 GitHub_M

GHSA-h35f-9h28-mq5c PYSEC-2026-3447

Authentication Bypass Python Apple Setuptools Red Hat Suse

6.1

CVSS 3.1 · Vendor: GitHub_M

Severity by source

Vendor (GitHub_M) PRIMARY

6.1 MEDIUM

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

vuln.today AI

5.3 MEDIUM

AC:H reflects three required preconditions (macOS APFS/HFS+, NFD-normalized filename, active MANIFEST.in exclusion rule); no availability impact applies.

3.1 AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

4.0 AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

SUSE

MEDIUM

qualitative

Red Hat

6.1 MEDIUM

qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Lifecycle Timeline

Patch available

Jul 08, 2026 - 18:02 EUVD

Analysis Generated

Jul 08, 2026 - 17:17 vuln.today

CVE Published

Jul 08, 2026 - 16:02 cve.org

MEDIUM 6.1

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

127 pypi packages depend on setuptools (45 direct, 83 indirect)

Ecosystem-wide dependent count for version 83.0.0.

DescriptionCVE.org

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.

AnalysisAI

Setuptools prior to 83.0.0 fails to normalize Unicode filenames before matching them against MANIFEST.in exclusion patterns on macOS APFS and HFS+ filesystems, allowing files with NFD-normalized on-disk names to silently bypass NFC-encoded exclude, global-exclude, recursive-exclude, and prune directives and be packed into Python source distributions. Python package maintainers developing on macOS face a supply chain risk: sensitive files such as credentials, private keys, or environment configs that are correctly listed in MANIFEST.in for exclusion may still appear in tarballs published to PyPI or private registries. No public exploit has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.

Technical ContextAI

The vulnerability (CWE-176: Improper Handling of Unicode Encoding) resides in setuptools' FileList class, which processes MANIFEST.in directives by compiling glob patterns and matching them against on-disk filenames. The root cause is the absence of Unicode normalization on either the pattern or the filename side before comparison. macOS APFS and HFS+ filesystems canonicalize stored filenames to NFD (Normalization Form Decomposed), where accented or composite Unicode characters are stored as a base glyph followed by one or more combining code points. Most text editors and shells produce NFC (Normalization Form Composed) output when a developer writes an exclusion rule - so the byte sequences of pattern and filename differ even when they represent the same visible string. The affected CPE is cpe:2.3:a:pypa:setuptools:*:*:*:*:*:*:*:* covering all versions prior to 83.0.0. The fix, committed at dd9f436a36486b4cb8a4c70a2321548b0be09b8f, normalizes filenames prior to glob matching to eliminate this form mismatch.

RemediationAI

Upgrade setuptools to version 83.0.0 or later, which normalizes Unicode filenames before applying MANIFEST.in glob exclusions. The release is available at https://github.com/pypa/setuptools/releases/tag/v83.0.0 and can be installed via pip install --upgrade setuptools. Until patching is possible, maintainers on macOS should manually audit built sdist tarballs before publishing by running tar tzf dist/*.tar.gz and verifying no sensitive files are present - this inspection adds a human gate that the broken exclusion logic cannot be relied upon to provide. Running python -m build within a Linux-based CI pipeline (e.g., GitHub Actions on ubuntu-latest) rather than on a local macOS workstation is a reliable compensating control, as Linux filesystems do not NFD-normalize filenames and exclusion rules will function correctly. Renaming sensitive files to ASCII-only names removes the normalization ambiguity entirely but does not fix the underlying bug and should not substitute for patching.

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Vendor StatusVendor

SUSE

Severity: Moderate

Product	Status
SUSE Linux Enterprise Desktop 15 SP7	Not-Affected
SUSE Linux Enterprise Desktop 15 SP7	Not-Affected
SUSE Linux Enterprise Desktop 15 SP7	Not-Affected
SUSE Linux Enterprise High Performance Computing 12	Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7	Not-Affected

CVE-2026-59890 vulnerability details – vuln.today

Back

setuptools CVE-2026-59890

Severity by source

CVSS VectorVendor: GitHub_M

Lifecycle Timeline

Blast Radius

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Python

Same weakness CWE-176 – Improper Handling of Unicode Encoding

Same technique Authentication Bypass

Vendor StatusVendor

SUSE

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External POC / Exploit Code