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CVE-2026-44639

NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing

CVSS 3.1 3.7 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-44639

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-44639

Published

nanomq

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nanomq",
                    "product": "nanomq",
                    "versions": [
                        {
                            "version": "< 0.24.14",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON