CVE-2026-44640Public exploit

Service hang via QUIC dialer type confusion

Published May 29, 2026 · Updated May 29, 2026

Type confusion in NanoMQ before 0.24.14 allows local users to hang the broker by closing a QUIC dialer during connection setup. The nni_quic_dialer_close path reads aio->prov_data as an ex_quic_conn pointer even though dialing stored an nni_quic_conn pointer there. Triggering requires local execution and a pending dial AIO; the demonstrated result is a broker hang, while a crash depends on memory layout and timing.

CVSS severity4.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in NanoMQ before 0.24.14 allows local users to hang the broker by closing a QUIC dialer during connection setup. The nni_quic_dialer_close path reads aio->prov_data as an ex_quic_conn pointer even though dialing stored an nni_quic_conn pointer there. Triggering requires local execution and a pending dial AIO; the demonstrated result is a broker hang, while a crash depends on memory layout and timing.

The record

CVE
CVE-2026-44640
Published
May 29, 2026
Updated
May 29, 2026
Vendor
EMQ Technologies
Product
NanoMQ
Classifications
CWE-843, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 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=< 0.24.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

EMQ Technologies · NanoMQversion=< 0.24.14

Published CVSS scores

4.5GitHubCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499.004Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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