CVE-2026-44639
NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-407 |
| Vendor | nanomq |
| Product | nanomq |
| Published | Sep 18, 2026 |
| Last Updated | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
nanomq / nanomq
< 0.24.14
References
github.com: https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv github.com: https://github.com/nanomq/NanoNNG/pull/1508 github.com: https://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07 github.com: https://github.com/nanomq/nanomq/releases/tag/0.24.14