CVE-2026-44639

LowCVSS 3.7/10Last modified Sep 18, 2026

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.

Metrics

CVSS 3.1 3.7/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

Affected software

No affected versions have been published.

Timeline

Published
Sep 18, 2026
Last modified
Sep 18, 2026
NVD status
Deferred

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CVE-2026-44639: Low severity, CVSS 3.7 | Vulnix