Vulnerability Description
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.7, DNSCache._async_add inserted every response record into cache, _expirations, _expire_heap, and service_cache without a cap, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to multicast valid mDNS responses with unique names and cause memory exhaustion, slower cache lookups, slower async_expire passes, and broken discovery, registration, and ServiceBrowser callbacks. This issue is fixed in version 0.149.7.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Paulsm | Zeroconf | < 0.149.7 |
Related Weaknesses (CWE)
References
- https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d32Patch
- https://github.com/python-zeroconf/python-zeroconf/issues/1715Issue TrackingPatch
- https://github.com/python-zeroconf/python-zeroconf/pull/1718Issue TrackingPatch
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.7Release Notes
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-rfg2Vendor AdvisoryPatch
FAQ
What is CVE-2026-47184?
CVE-2026-47184 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.7, DNSCache._async_add inserted every response record into cache, _expirations, _expire_heap, and service_ca...
How severe is CVE-2026-47184?
CVE-2026-47184 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47184?
Check the references section above for vendor advisories and patch information. Affected products include: Paulsm Zeroconf.