CVE-2026-47184

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductPaulsm Zeroconf

PublishedJul 17, 2026

First seenJul 17, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

paulsm zeroconf0.149.7 or later
zeroconf0.149.7 or later

Affected products

Product	Affected versions	Fixed in
paulsm zeroconf	v < 0.149.7	0.149.7
zeroconfPyPI	v < 0.149.7	0.149.7

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