CVE-2025-59946: nanomq Use-After-Free

Description

NanoMQ MQTT Broker (NanoMQ) is an Edge Messaging Platform. Prior to version 0.24.2, there is a classical data racing issue about sub info list which could result in heap use after free crash. This issue has been patched in version 0.24.2.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
emqx	nanomq	< 0.24.4

References

Advisories & Patches

https://github.com/nanomq/nanomq/security/advisories/GHSA-xg37-23w7-72p5

Exploits

https://github.com/nanomq/nanomq/issues/1863

Frequently Asked Questions

What is CVE-2025-59946? +

NanoMQ MQTT Broker (NanoMQ) is an Edge Messaging Platform. Prior to version 0.24.2, there is a classical data racing issue about sub info list which could result in heap use after free crash. This issue has been patched in version 0.24.2. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-59946? +

CVE-2025-59946 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-59946? +

CVE-2025-59946 affects products from emqx, specifically: nanomq. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59946? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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