CVE-2026-47184

Description

zeroconf has unbounded DNS record cache that allows LAN-local memory exhaustion via multicast flood

Overview

State

—

Assigner (CNA)

—

CVSS severity

medium

CVSS score

6.5 / 10

CVSS vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Effective score

6.5 / 10 MEDIUM source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2026-47184

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2026-07-17 19:17:15 UTC

NVD last modified

2026-07-23 16:13:02 UTC

NVD CVSS v3.1

6.5 / 10 MEDIUM source: security-advisories@github.com

NVD CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability subscore

2.8 / 10

Impact subscore

3.6 / 10

EPSS score

0.0024 (probability of exploitation in next 30 days)

EPSS percentile

15.44% vs all CVEs — higher = more likely to be exploited, as of 2026-08-01

NVD-assigned CWE(s): CWE-770 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-45249

Assigner

GitHub_M

Published

Jul 17, 2026, 6:25:07 PM

Updated

Jul 21, 2026, 1:50:36 AM

EUVD base score (CVSS 3.1)

6.5 / 10
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EUVD-reported EPSS

0.2400

Vendors

python-zeroconf

Products

python-zeroconf (< 0.149.7)

Aliases

GHSA-rfg2-pjw2-56x2, PYSEC-2026-3439

ENISA 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.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (2)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://nvd.nist.gov/vuln/detail/CVE-2026-47184 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-47184 tenable:www.cve.org

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  2026-06-19 02:54 UTC
• Security Update Guide - Microsoft Security Response Center
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  Security Update Guide - Microsoft Security Response Center

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• Oracle Critical Patch Update Advisory - April 2026
  web:www.oracle.com

  This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

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• Oracle Critical Security Patch Update Advisory - May 2026
  web:www.oracle.com

  This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.

  2026-06-19 02:54 UTC
• Patch Tuesday June 2026: Security Updates & CVE Analysis
  web:zecurit.com

  Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

  2026-06-19 02:54 UTC

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