CVE-2026-47275Public exploitNetwork attack vector

Client crash via wrong CONNECT property pointer

Published Jul 20, 2026 · Updated Jul 20, 2026

Remote denial of service in EMQ Technologies NanoMQ 0.24.11 and earlier allows remote authenticated users to crash connecting MQTTv5 clients. The nni_mqttv5_msg_decode_connect function advances prop instead of will_prop while parsing will properties, so a packet without CONNECT properties dereferences a NULL pointer. Exploitation requires control of the broker endpoint and a client or bridge connection; one packet crashes the process, and auto-reconnect can sustain the crash loop.

CVSS severity2.6
Low
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote denial of service in EMQ Technologies NanoMQ 0.24.11 and earlier allows remote authenticated users to crash connecting MQTTv5 clients. The nni_mqttv5_msg_decode_connect function advances prop instead of will_prop while parsing will properties, so a packet without CONNECT properties dereferences a NULL pointer. Exploitation requires control of the broker endpoint and a client or bridge connection; one packet crashes the process, and auto-reconnect can sustain the crash loop.

The record

CVE
CVE-2026-47275
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
EMQ Technologies
Product
NanoMQ
Classifications
CWE-476, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=<= 0.24.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

EMQ Technologies · NanoMQversion=<= 0.24.11

Published CVSS scores

2.6GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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