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CVE-2026-44639

3.7 · LOW

NanoMQ is an MQTT broker.

Published Sep 18, 2026CWE-407EPSS 0.44%

Overview

CVE-2026-44639 is a low-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

NanoMQ is an MQTT broker. Prior to 0.24.14, NanoMQ's MQTT v5 property decoder in nng/src/supplemental/mqtt/mqtt_codec.c uses property_append() to walk the entire linked list for each property added by decode_buf_properties(). A remote unauthenticated client can supply a PUBLISH or SUBSCRIBE packet containing many User Properties, causing O(N²) linked-list insertion and CPU work that makes the broker unresponsive; repeated packets can sustain the denial of service. This issue is fixed in version 0.24.14.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07GitHubgithub.com/nanomq/NanoNNG/pull/1508GitHubgithub.com/nanomq/nanomq/releases/tag/0.24.14GitHubgithub.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrvGitHubgithub.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv

How CyberStrike helps

Frequently asked questions

What is CVE-2026-44639?

CVE-2026-44639 is a low-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-44639?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-44639?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-44639?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-44639 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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