CVE-2026-36590Public exploitNetwork attack vector

Broker crash via unreleased QoS message references

Published Jul 15, 2026 · Updated Jul 15, 2026

Resource exhaustion in EMQ NanoMQ 0.24.9 allows remote attackers to crash the broker through repeated QoS MQTT PUBLISH messages. The nni_qos_db_set function returns when its database pointer is NULL without releasing the cloned message reference, so each qualifying message leaks memory. The path requires sqlite.enable=true in a build without SQLite support; sustained unauthenticated traffic exhausts memory until the broker crashes.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in EMQ NanoMQ 0.24.9 allows remote attackers to crash the broker through repeated QoS MQTT PUBLISH messages. The nni_qos_db_set function returns when its database pointer is NULL without releasing the cloned message reference, so each qualifying message leaks memory. The path requires sqlite.enable=true in a build without SQLite support; sustained unauthenticated traffic exhausts memory until the broker crashes.

The record

CVE
CVE-2026-36590
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-772, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
CWE-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application 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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