CVE-2026-44639— NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing
Quick assessment
Affected
nanomq nanomq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 ca
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I. Basic Information for CVE-2026-44639
Vulnerability Information
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Vulnerability Title
NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-44639
| # | POC Description | Source Link | Shenlong Link |
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Patches & Fixes for CVE-2026-44639 (2)
Vendor Pages for CVE-2026-44639 (1)
Other References for CVE-2026-44639 (1)
Same Patch Batch · nanomq · 2026-09-18 · 3 CVEs total
| CVE-2026-73863 | 7.0 HIGH | NanoMQ: Heap-Buffer-Overflow in `nmq_subinfo_decode()` During MQTT v5 SUBSCRIBE Parsing |
| CVE-2026-61633 | 2.0 LOW | NanoMQ: Infinite Loop in UNSUBSCRIBE Decoder Leading to Remote DoS |
IV. Related Vulnerabilities
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CVE-2026-73863
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