CVE-2026-25627: NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform

Q: How do I fix CVE-2026-25627?

nanomq: upgrade to 0.24.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-25627 being exploited?

CVE-2026-25627 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-2026-25627 affect?

CVE-2026-25627 affects nanomq. Severity is medium (CVSS 6.5). NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.8, NanoMQ’s MQTT-over-WebSocket transport can be crashed by sending an MQTT packet with a deliberately large Remaining Length in the fixed header wh

Q: How urgent is CVE-2026-25627?

Priority 38/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-25627 is a medium-severity flaw (CVSS 6.5) 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. Prior to version 0.24.8, NanoMQ’s MQTT-over-WebSocket transport can be crashed by sending an MQTT packet with a deliberately large Remaining Length in the fixed header while providing a much shorter actual payload. The code path copies Remaining Length bytes without verifying that the current receive buffer contains that many bytes, resulting in an out-of-bounds read (ASAN repo

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-03-30
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

2026-03-30 21:17 UTCPublished CVE record published
2026-06-17 10:24 UTCUpdated Record last modified

emqx nanomq UPGRADE

Affected: < 0.24.8

Fixed in: 0.24.8

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.24.8 (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-2026-25627?

nanomq: upgrade to 0.24.8. Exact commands for each OS are on this page.

Is CVE-2026-25627 being exploited?

CVE-2026-25627 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-2026-25627 affect?

CVE-2026-25627 affects nanomq. Severity is medium (CVSS 6.5). NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.8, NanoMQ’s MQTT-over-WebSocket transport can be crashed by sending an MQTT packet with a deliberately large Remaining Length in the fixed header wh

How urgent is CVE-2026-25627?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2026-36590 HIGH 7.5 DOWNGRADE An issue in EMQ NanoMQ v.0.24.9 allows a remote attacker to cause a denial of service via the nni_qos_db_set f
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-2026-22040 MEDIUM 5.3 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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