CVE-2026-34608: NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform

Q: How do I fix CVE-2026-34608?

nanomq: upgrade to 0.24.10. Exact commands for each OS are on this page.

Q: Is CVE-2026-34608 being exploited?

CVE-2026-34608 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-2026-34608 affect?

CVE-2026-34608 affects nanomq. Severity is medium (CVSS 4.9). NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.10, in NanoMQ's webhook_inproc.c, the hook_work_cb() function processes nng messages by parsing the message body with cJSON_Parse(body). The body is

Q: How urgent is CVE-2026-34608?

Priority 30/100. Public exploit reference

Routine

MEDIUM 4.9UPGRADE

CVE-2026-34608 is a medium-severity flaw (CVSS 4.9) 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 0.24.10, in NanoMQ's webhook_inproc.c, the hook_work_cb() function processes nng messages by parsing the message body with cJSON_Parse(body). The body is obtained from nng_msg_body(msg), which is a binary buffer without a guaranteed null terminator. This leads to an out-of-bounds read (OOB read) as cJSON_Parse reads until it finds a \0, potentially accessing me

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-125, CWE-457
Published	2026-04-02
Last modified	2026-07-24

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

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 18:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

emqx nanomq UPGRADE

Affected: < 0.24.10

Fixed in: 0.24.10

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.24.10 (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-2026-34608?

nanomq: upgrade to 0.24.10. Exact commands for each OS are on this page.

Is CVE-2026-34608 being exploited?

CVE-2026-34608 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-2026-34608 affect?

CVE-2026-34608 affects nanomq. Severity is medium (CVSS 4.9). NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.10, in NanoMQ's webhook_inproc.c, the hook_work_cb() function processes nng messages by parsing the message body with cJSON_Parse(body). The body is

How urgent is CVE-2026-34608?

Priority 30/100. Public exploit reference

Related CVEs

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CVE-2026-32696 LOW 3.1 UPGRADE NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform
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CVE-2026-22040 MEDIUM 5.3 UPGRADE NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform
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References

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