CVE-2026-47183
Zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion
Description
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.6, DNSIncoming._log_exception_debug and the four QuietLogger exception-dedup methods stored an unbounded _seen_logs dictionary keyed by attacker-influenced IncomingDecodeError messages, retaining sys.exc_info() tracebacks whose frame locals kept raw packet self.data buffers and allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to drive memory growth until mDNS-dependent features degrade or the process is OOM-killed. This issue is fixed in version 0.149.6.
INFO
Published Date :
July 17, 2026, 7:17 p.m.
Last Modified :
Aug. 17, 2026, 7:50 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 0.149.6.
- Remove unauthenticated hosts on local link.
- Monitor mDNS dependent features.
Public PoC/Exploit Available at Github
CVE-2026-47183 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-2026-47183.
| URL | Resource |
|---|---|
| https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec | Patch |
| https://github.com/python-zeroconf/python-zeroconf/issues/1714 | Issue Tracking Patch |
| https://github.com/python-zeroconf/python-zeroconf/pull/1717 | Issue Tracking Patch |
| https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6 | Release Notes |
| https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5 | 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-2026-47183 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-2026-47183
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-2026-47183 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-47183 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) 0.149.6 Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec Types: Patch Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/issues/1714 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/pull/1717 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5 Types: Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 18, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-47183', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-17T21:08:53.994450Z'} -
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': '< 0.149.6'}]}] Added Description Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.6, DNSIncoming._log_exception_debug and the four QuietLogger exception-dedup methods stored an unbounded _seen_logs dictionary keyed by attacker-influenced IncomingDecodeError messages, retaining sys.exc_info() tracebacks whose frame locals kept raw packet self.data buffers and allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to drive memory growth until mDNS-dependent features degrade or the process is OOM-killed. This issue is fixed in version 0.149.6. Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added Reference https://github.com/python-zeroconf/python-zeroconf/commit/95561e28b24922358f1991e38e3a86d70d72dcec Added Reference https://github.com/python-zeroconf/python-zeroconf/issues/1714 Added Reference https://github.com/python-zeroconf/python-zeroconf/pull/1717 Added Reference https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.6 Added Reference https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-phvx-9mgw-67r5