CVE-2026-45151Public exploitNetwork attack vector

Remote broker crash via missing error return

Published May 29, 2026 · Updated May 29, 2026

NULL pointer dereference in NanoMQ 0.24.8 and earlier allows remote attackers to crash the broker via QUIC multistream traffic. In quic_stream_recv, a reopening substream can yield a null c pointer; the function finishes the AIO with an error but continues to lock c->mtx. Exploitation requires specific multistream reopen timing but no authentication or user interaction, and it terminates the broker process.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
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 0.24.8 and earlier allows remote attackers to crash the broker via QUIC multistream traffic. In quic_stream_recv, a reopening substream can yield a null c pointer; the function finishes the AIO with an error but continues to lock c->mtx. Exploitation requires specific multistream reopen timing but no authentication or user interaction, and it terminates the broker process.

The record

CVE
CVE-2026-45151
Published
May 29, 2026
Updated
May 29, 2026
Vendor
EMQ Technologies
Product
NanoMQ
Classifications
CWE-476, T1499.004
Attack vector
network
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=<= 0.24.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EMQ Technologies · NanoMQversion=<= 0.24.8

Published CVSS scores

2.9GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

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-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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