GHSA-94v7-wxj6-r2q5: Multicast Remote Code Execution Vulnerability

MODERATE
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CWE-1395
Published
Advisory Summary

GHSA-94v7-wxj6-r2q5 is a MODERATE remote code execution vulnerability (CWE-1395: Dependency on Vulnerable Third-Party Component) affecting Multicast libraries in the PyPI ecosystem. The issue involves multicast in source builds from vulnerable setuptools dependency. Remediation is available by upgrading affected packages to version 2.0.9a0.

GHSA-94v7-wxj6-r2q5 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-94v7-wxj6-r2q5
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-1395: Dependency on Vulnerable Third-Party Component
Affected Product Multicast
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix GHSA-94v7-wxj6-r2q5

To remediate this vulnerability, upgrade all affected Multicast dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

multicast fixed: 2.0.9a0 
pip install multicast>=2.0.9a0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show multicast

How to Check if You Are Affected

To determine whether your Python environment is affected by GHSA-94v7-wxj6-r2q5, inspect your installed packages using pip:

pip show multicast

Analyze the terminal output to locate any version of Multicast in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.9a0), your application is affected.

Note: The pip show multicast command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1395: Dependency on Vulnerable Third-Party Component, where the product has a dependency on a third-party component that contains one or more known vulnerabilities. In Multicast, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact * Some source-builds may be impacted by a CWE-1395 (eg. vulnerable `setuptools` dependency). * Multicast prior to v2.0.9a3 on systems with minimal dependancies installed may use `setuptools <78.1.1` and thus rely on a compromised dependency. In some cases there is a chance that source-builds would fail due to an exploit of the closely related CVE-2025-47273, or become arbitrarily modified. ### Patches * Pre-release version v2.0.9a0 and later resolve the issue by bumping requirements to `setuptools>=80.4` * Pre-release version v2.0.9a3 and later are recommended for improved stability over v2.0.9a0 ### Workarounds * Further hardening in v2.0.9a4+ of the build process in CI builds allowing source builds to be verified via GH attestations. ### References * [GHSA-5rjg-fvgr-3xxf](https://github.com/pypa/setuptools/security/advisories/GHSA-5rjg-fvgr-3xxf) * pypa/setuptools#4946 ### Fixes * https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/tests/requirements.txt#L32 * https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/docs/requirements.txt#L27 * https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/requirements.txt#L26 * https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/pyproject.toml#L2

GHSA-94v7-wxj6-r2q5 Affected Multicast Versions

1 component(s)
Fixed Versions:
2.0.9a0
Product / Package Ecosystem Affected Versions Fixed Version
multicast
pypi/multicast
PyPI
< 2.0.9a0
2.0.9a0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pypa/setuptools/security/advisories/GHSA-5rjg-fvgr-3xxf
GitHub Advisory / Wiki ADVISORY
https://github.com/reactive-firewall/multicast/security/advisories/GHSA-94v7-wxj6-r2q5
Multicast Source Repository REPOSITORY
https://github.com/pypa/setuptools/issues/4946
Security Fix Commit FIX COMMIT
https://github.com/reactive-firewall/multicast/commit/c5c7c7de272421d944beca8452871bca6bfd151f
Multicast Source Repository REPOSITORY
https://github.com/reactive-firewall/multicast
Multicast Source Repository REPOSITORY
https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/docs/requirements.txt#L27
Multicast Source Repository REPOSITORY
https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/pyproject.toml#L2
Multicast Source Repository REPOSITORY
https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/requirements.txt#L26
Multicast Source Repository REPOSITORY
https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/tests/requirements.txt#L32

Frequently Asked Questions

What is GHSA-94v7-wxj6-r2q5?
GHSA-94v7-wxj6-r2q5 is a security vulnerability in Multicast involving multicast in source builds from vulnerable setuptools dependency under CWE-1395: Dependency on Vulnerable Third-Party Component.
Which Multicast versions are affected?
Affected versions include releases prior to 2.0.9a0 across affected packages: multicast.
What version fixes GHSA-94v7-wxj6-r2q5?
Upgrading to 2.0.9a0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is multicast affected?
Yes, multicast is affected in releases prior to 2.0.9a0. Upgrade your dependency to 2.0.9a0 or later.
What CWE is associated with GHSA-94v7-wxj6-r2q5?
GHSA-94v7-wxj6-r2q5 is classified under CWE-1395: Dependency on Vulnerable Third-Party Component (The product has a dependency on a third-party component that contains one or more known vulnerabilities.).
How can I check PyPI dependencies for GHSA-94v7-wxj6-r2q5?
Run the dependency tree command: 'pip show multicast'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-94v7-wxj6-r2q5",
  "modified" : "2025-05-28T21:07:05Z",
  "published" : "2025-05-28T21:07:05Z",
  "aliases" : [ ],
  "summary" : "multicast in source builds from vulnerable setuptools dependency",
  "details" : "### Impact\n * Some source-builds may be impacted by a CWE-1395 (eg. vulnerable `setuptools` dependency).\n   * Multicast prior to v2.0.9a3 on systems with minimal dependancies installed may use `setuptools <78.1.1` and thus rely on a compromised dependency. In some cases there is a chance that source-builds would fail due to an exploit of the closely related CVE-2025-47273, or become arbitrarily modified.\n\n### Patches\n * Pre-release version v2.0.9a0 and later resolve the issue by bumping requirements to `setuptools>=80.4`\n   * Pre-release version v2.0.9a3 and later are recommended for improved stability over v2.0.9a0\n\n### Workarounds\n * Further hardening in v2.0.9a4+ of the build process in CI builds allowing source builds to be verified via GH attestations.\n\n### References\n* [GHSA-5rjg-fvgr-3xxf](https://github.com/pypa/setuptools/security/advisories/GHSA-5rjg-fvgr-3xxf)\n* pypa/setuptools#4946\n\n### Fixes\n* https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/tests/requirements.txt#L32\n* https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/docs/requirements.txt#L27\n* https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/requirements.txt#L26\n* https://github.com/reactive-firewall/multicast/blob/c5c7c7de272421d944beca8452871bca6bfd151f/pyproject.toml#L2",
  "severity" : [ {
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  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/reactive-firewall/multicast"
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  } ],
  "database_specific" : {
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    "nvd_published_at" : null
  }
}