CVE-2026-44639 Details
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.
A denial-of-service vulnerability has been identified in NanoMQ, an MQTT broker, in versions prior to 0.24.14. The issue arises in the MQTT v5 property decoder, where the 'property_append()' function inefficiently processes linked list insertions. This flaw allows a remote, unauthenticated client to send PUBLISH or SUBSCRIBE packets with numerous User Properties, causing a quadratic increase in processing time. The broker becomes unresponsive, and this denial-of-service condition can be sustained with repeated packets.
Users are advised to upgrade to NanoMQ version 0.24.14 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 18, 2026CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv | CISA-ADP | AdvisoryExploitRemedyTechnical DescriptionVendor |
| https://github.com/nanomq/nanomq/releases/tag/0.24.14 | [email protected] | Release NotesVendor |
| https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv | [email protected] | AdvisoryExploitRemedyTechnical DescriptionVendor |
| https://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07 | [email protected] | Source CodeVendor |
| https://github.com/nanomq/NanoNNG/pull/1508 | [email protected] | Source CodeVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-407 | Inefficient Algorithmic Complexity | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| NanoMQ | 0.24.13 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 18, 2026 | CVE Modified | CISA-ADP |
| Sep 18, 2026 | New CVE Received | [email protected] |