CVE-2026-47184

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d322283d148efb2cef6e4	Patch
https://github.com/python-zeroconf/python-zeroconf/issues/1715	Issue Tracking Patch
https://github.com/python-zeroconf/python-zeroconf/pull/1718	Issue Tracking Patch
https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.7	Release Notes
https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-rfg2-pjw2-56x2	Vendor Advisory Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:paulsm:zeroconf:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-07-17 19:17

Updated : 2026-08-17 19:56

NVD link : CVE-2026-47184

Mitre link : CVE-2026-47184

CVE.ORG link : CVE-2026-47184

JSON object : View

Products Affected

paulsm

zeroconf

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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