VDB
CVE-2026-47184
CVE-2026-47184
PUBLISHED
CVSS 6.5 MEDIUM
Reported by GitHub_M · Published July 17, 2026
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.
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| python-zeroconf | python-zeroconf | < 0.149.7 |
| PyPI | zeroconf | 0 |
| python-zeroconf | python-zeroconf | < 0.149.7, < 0.149.7 |
Timeline
- May 29, 2026 CVE Published
- Jun 1, 2026 Security Advisory
- Jul 18, 2026 EPSS Score
- Jul 21, 2026 CVE Updated
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 4, 2026 EPSS Score
References
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-rfg2-pjw2-56x2 x_refsource_CONFIRM
- https://github.com/python-zeroconf/python-zeroconf/issues/1715 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/pull/1718 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d322283d148efb2cef6e4 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.7 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-47184 advisory
- https://github.com/advisories/GHSA-rfg2-pjw2-56x2 advisory