{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "16bdb38921e7bbeab887cf229c2eb145889dfa88"
            }
          ],
          "repo": "https://github.com/nanomq/nanomq",
          "type": "GIT"
        },
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.24.14"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "91bd4c7f45f945a3f5f0e37c459157dc7c277a07"
            }
          ],
          "repo": "https://github.com/nanomq/nanonng",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6mwg-445v-2qrv"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44639.json"
  },
  "details": "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.",
  "id": "CVE-2026-44639",
  "modified": "2026-09-20T11:30:29.171682059Z",
  "published": "2026-09-18T16:17:56.222Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nanomq/nanomq/releases/tag/0.24.14"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44639.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44639"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nanomq/NanoNNG/pull/1508"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing"
}