python-zeroconf: Zeroconf is a pure Python implementation of multicast DNS service discovery
CVE-2026-48045 is fixed in python-zeroconf on 1 platform, first by OPENSUSE-SU-2026:21175-1, released June 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-zeroconf · Debian 14 | 0.149.16-1 | DEBIAN-CVE-2026-48045 | Jul 18, 2026 |
| python-zeroconf · opensuse-leap 16.0 | 0.136.0-bp160.2.1 | OPENSUSE-SU-2026:21175-1 | Jun 30, 2026 |
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