GHSA-94v7-wxj6-r2q5
multicast in source builds from vulnerable setuptools dependency
Blast Radius
multicastReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
- Some source-builds may be impacted by a CWE-1395 (eg. vulnerable
setuptoolsdependency).- Multicast prior to v2.0.9a3 on systems with minimal dependancies installed may use
setuptools <78.1.1and 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.
- Multicast prior to v2.0.9a3 on systems with minimal dependancies installed may use
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
- 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
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | multicast | all versions | 2.0.9a0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for multicast. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update multicast to 2.0.9a0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-94v7-wxj6-r2q5 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-94v7-wxj6-r2q5 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-94v7-wxj6-r2q5. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-94v7-wxj6-r2q5 in your dependencies?
O3 detects GHSA-94v7-wxj6-r2q5 across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.