CVE-2026-47184 — Zeroconf: Unbounded DNS record cache allows LAN-local memory exhaustion via multicast flood
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, _expi…
Published: 2026-07-17 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7