CVE-2026-47184

LAN-local memory exhaustion via unbounded DNS cache

Published Jul 17, 2026 · Updated Jul 17, 2026

Uncontrolled resource consumption in python-zeroconf before 0.149.7 allows remote attackers to exhaust memory via multicast mDNS responses. DNSCache._async_add stores every response record in the main cache, expiration map and heap, and service cache without limiting their entry counts. Any unauthenticated host on the local link can flood unique names or replay records with changing TTLs, slowing discovery callbacks or terminating a memory-constrained process.

CVSS severity6.5
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in python-zeroconf before 0.149.7 allows remote attackers to exhaust memory via multicast mDNS responses. DNSCache._async_add stores every response record in the main cache, expiration map and heap, and service cache without limiting their entry counts. Any unauthenticated host on the local link can flood unique names or replay records with changing TTLs, slowing discovery callbacks or terminating a memory-constrained process.

The record

CVE
CVE-2026-47184
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
python-zeroconf
Product
python-zeroconf
Classifications
CWE-770, T1499.002
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.149.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

python-zeroconf · python-zeroconfversion=< 0.149.7

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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