CVE-2026-22040: NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform

Q: How do I fix CVE-2026-22040?

nanomq: upgrade to 0.24.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-22040 being exploited?

CVE-2026-22040 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-22040 affect?

CVE-2026-22040 affects nanomq. Severity is medium (CVSS 5.3). NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, by generating a combined traffic pattern of high-frequency publishes and rapid reconnect/kick-out using the same ClientID and massive subscribe/unsubsc

Q: How urgent is CVE-2026-22040?

Priority 27/100. Public exploit reference

Routine

MEDIUM 5.3UPGRADE

CVE-2026-22040 is a medium-severity flaw (CVSS 5.3) affecting nanomq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, by generating a combined traffic pattern of high-frequency publishes and rapid reconnect/kick-out using the same ClientID and massive subscribe/unsubscribe jitter, it is possible to reliably trigger heap memory corruption in the Broker process, causing it to exit immediately with SIGABRT due to free(): invalid pointer. As of time of publication, no known patc

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-03-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: emqx

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-04 22:16 UTCPublished CVE record published
2026-06-17 10:19 UTCUpdated Record last modified

emqx nanomq UPGRADE

Affected: < 0.24.6

Fixed in: 0.24.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nanomq || rpm -q nanomq || nanomq --version

2. UPGRADE to 0.24.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nanomq

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nanomq

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-22040?

nanomq: upgrade to 0.24.6. Exact commands for each OS are on this page.

Is CVE-2026-22040 being exploited?

CVE-2026-22040 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-22040 affect?

CVE-2026-22040 affects nanomq. Severity is medium (CVSS 5.3). NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, by generating a combined traffic pattern of high-frequency publishes and rapid reconnect/kick-out using the same ClientID and massive subscribe/unsubsc

How urgent is CVE-2026-22040?

Priority 27/100. Public exploit reference

Related CVEs

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CVE-2026-34608 MEDIUM 4.9 UPGRADE NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform
CVE-2026-32696 LOW 3.1 UPGRADE NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform
CVE-2026-25627 MEDIUM 6.5 UPGRADE NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform
CVE-2025-68699 MEDIUM 6.5 DOWNGRADE NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform

References

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