CVE-2026-47276Public exploitNetwork attack vector

Authenticated broker crash via malformed user properties

Published Jul 20, 2026 · Updated Jul 20, 2026

NULL pointer dereference in NanoMQ 0.24.11 and earlier allows remote authenticated users to crash the broker via its REST publish API. The properties_parse function treats user_properties arrays as objects and calls strlen on a null item key while iterating over array elements. Valid REST API credentials and network access to the HTTP service are required; one request terminates the broker and disconnects all MQTT clients.

CVSS severity6.5
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in NanoMQ 0.24.11 and earlier allows remote authenticated users to crash the broker via its REST publish API. The properties_parse function treats user_properties arrays as objects and calls strlen on a null item key while iterating over array elements. Valid REST API credentials and network access to the HTTP service are required; one request terminates the broker and disconnects all MQTT clients.

The record

CVE
CVE-2026-47276
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
EMQ Technologies
Product
NanoMQ
Classifications
CWE-476, T1499.004
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

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499.004Application or System Exploitation

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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