VDB
CVE-2026-48045
CVE-2026-48045
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 0.149.12, AsyncListener.handle_query_or_defer retained every truncated TC-bit incoming query, each up to _MAX_MSG_ABSOLUTE = 8966 bytes, in self._deferred[addr] and armed a per-address timer in self._timers[addr] without capping the per-address list or distinct addr keys, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to spoof sources, grow _deferred and _timers, and cause memory exhaustion and quadratic CPU burn. This issue is fixed in version 0.149.12.
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 | < 0.149.12 |
| python-zeroconf | python-zeroconf | < 0.149.12 |
Timeline
- Jun 11, 2026 CVE Published
- Jul 17, 2026 Coalition ESS Score
- Jul 18, 2026 EPSS Score
- Jul 18, 2026 Security Advisory
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
References
- https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-9663-mqmp-p9mm x_refsource_CONFIRM
- https://github.com/python-zeroconf/python-zeroconf/pull/1751 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/commit/b22c8ff19c66c68907d220a4823c0950f4fa93f7 x_refsource_MISC
- https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.12 x_refsource_MISC