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CVE-2026-61633

2.0 · LOW

NanoMQ is an MQTT broker.

Published Sep 18, 2026CWE-835EPSS 0.34%

Overview

CVE-2026-61633 is a low-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 2.0 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.0, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

NanoMQ is an MQTT broker. Prior to 0.24.14, the NanoMQ client function nni_mqtt_msg_decode_unsubscribe() in nng/src/supplemental/mqtt/mqtt_codec.c does not handle a failed read_uint16() while counting topics in a malformed UNSUBSCRIBE packet. A zero-length topic followed by trailing data can leave buf.curpos unchanged while topic_count continues to increase, allowing a malicious MQTT broker to hang a connecting MQTT 3.1.1 client, consume CPU and memory, and repeatedly deny service when automatic reconnection is enabled. The broker-side nmq_unsubinfo_decode path is not affected. 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/fa8d859bb39841e46cfc6cce280d242bd782ad3dGitHubgithub.com/nanomq/NanoNNG/pull/1518GitHubgithub.com/nanomq/nanomq/releases/tag/0.24.14GitHubgithub.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhrGitHubgithub.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr

How CyberStrike helps

Frequently asked questions

What is CVE-2026-61633?

CVE-2026-61633 is a low-severity vulnerability. It was published on September 18, 2026 and has a CVSS 3.1 base score of 2.0 (LOW).

How severe is CVE-2026-61633?

This vulnerability has a CVSS 3.1 base score of 2.0, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-61633?

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-2026-61633?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-61633 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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