FKIE_CVE-2026-21888

Vulnerability from fkie_nvd - Published: 2026-03-11 16:16 - Updated: 2026-06-17 10:19
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.
References
security-advisories@github.comhttps://github.com/nanomq/nanomq/issues/2192Issue Tracking
security-advisories@github.comhttps://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5Exploit, Vendor Advisory
Impacted products
Vendor Product Version
emqx nanomq *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "nanomq",
          "vendor": "nanomq",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 0.24.6"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "490B7BD1-582C-4755-985F-7A3682332DEE",
              "versionEndIncluding": "0.24.6",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier."
    },
    {
      "lang": "es",
      "value": "NanoMQ MQTT Broker (NanoMQ) es una Plataforma de Mensajer\u00eda de Borde integral. An\u00e1lisis de enteros de bytes variables de MQTT v5 fuera de l\u00edmites: get_var_integer() acepta varints de 5 bytes sin comprobaciones de l\u00edmites; desencadena de forma fiable una lectura fuera de l\u00edmites / ca\u00edda cuando se compila con ASan. Esto afecta a la versi\u00f3n 0.24.6 y anteriores."
    }
  ],
  "id": "CVE-2026-21888",
  "lastModified": "2026-06-17T10:19:05.750",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21888",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-11T15:35:24.683645Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-11T16:16:23.930",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/nanomq/nanomq/issues/2192"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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