GHSA-94v7-wxj6-r2q5 — multicast
Fix: reactive-firewall/multicast@c5c7c7dGHSA-94v7-wxj6-r2q5 is a security vulnerability in multicast. A fix is available for multicast — see the affected versions and patch details below.
multicast in source builds from vulnerable setuptools dependency
Real-World Exposure
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 | 2.0.9a0pip install --upgrade 'multicast==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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-94v7-wxj6-r2q5 can be triaged on real exposure rather than presence alone.
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 Security finds GHSA-94v7-wxj6-r2q5 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.