{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44639","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-05-07T15:30:10.875Z","datePublished":"2026-09-18T16:17:56.222Z","dateUpdated":"2026-09-18T17:21:50.284Z"},"containers":{"cna":{"title":"NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing","problemTypes":[{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"references":[{"name":"https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv"},{"name":"https://github.com/nanomq/NanoNNG/pull/1508","tags":["x_refsource_MISC"],"url":"https://github.com/nanomq/NanoNNG/pull/1508"},{"name":"https://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07","tags":["x_refsource_MISC"],"url":"https://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07"},{"name":"https://github.com/nanomq/nanomq/releases/tag/0.24.14","tags":["x_refsource_MISC"],"url":"https://github.com/nanomq/nanomq/releases/tag/0.24.14"}],"affected":[{"vendor":"nanomq","product":"nanomq","versions":[{"version":"< 0.24.14","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-18T16:17:56.222Z"},"descriptions":[{"lang":"en","value":"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":{"advisory":"GHSA-6mwg-445v-2qrv","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-18T17:19:13.578066Z","id":"CVE-2026-44639","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-18T17:21:50.284Z"}}]}}