FKIE_CVE-2026-44639

Vulnerability from fkie_nvd - Published: 2026-09-18 17:16 - Updated: 2026-09-18 18:17
Severity
3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
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.
References
security-advisories@github.comhttps://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07
security-advisories@github.comhttps://github.com/nanomq/NanoNNG/pull/1508
security-advisories@github.comhttps://github.com/nanomq/nanomq/releases/tag/0.24.14
security-advisories@github.comhttps://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nanomq",
          "vendor": "nanomq",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.24.14"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NanoMQ is an MQTT broker. Prior to 0.24.14, NanoMQ\u0027s 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(N\u00b2) 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",
  "lastModified": "2026-09-18T18:17:06.990",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-44639",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-18T17:19:13.578066Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-18T17:16:57.127",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/NanoNNG/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/NanoNNG/pull/1508"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/nanomq/releases/tag/0.24.14"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-6mwg-445v-2qrv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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