CVE-2026-47184
Zeroconf: Unbounded DNS record cache allows LAN-local memory exhaustion via multicast flood
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.
INFO
Published Date :
July 17, 2026, 7:17 p.m.
Last Modified :
Aug. 17, 2026, 7:56 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Zeroconf to version 0.149.7.
- Monitor system resources after update.
- Verify service discovery functionality.
Public PoC/Exploit Available at Github
CVE-2026-47184 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-47184.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-47184 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-47184
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
MVidarr - The Music Video Management System
HTML Python Shell JavaScript CSS TypeScript Batchfile Dockerfile Mako Go Template
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-47184 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-47184 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 17, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:paulsm:zeroconf:*:*:*:*:*:python:*:* versions up to (excluding) 0.149.7 Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d322283d148efb2cef6e4 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/issues/1715 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/pull/1718 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.7 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-rfg2-pjw2-56x2 Types: Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 21, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-47184', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-21T01:50:24.015459Z'} -
New CVE Received by [email protected]
Jul. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'python-zeroconf', 'product': 'python-zeroconf', 'versions': [{'status': 'affected', 'version': '< 0.149.7'}]}] Added 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. Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://github.com/python-zeroconf/python-zeroconf/commit/0ad3f37b5b852b8f614d322283d148efb2cef6e4 Added Reference https://github.com/python-zeroconf/python-zeroconf/issues/1715 Added Reference https://github.com/python-zeroconf/python-zeroconf/pull/1718 Added Reference https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.7 Added Reference https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-rfg2-pjw2-56x2