FKIE_CVE-2026-32696

Vulnerability from fkie_nvd - Published: 2026-03-30 21:17 - Updated: 2026-04-13 14:07
Severity ?
3.1 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
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. In NanoMQ version 0.24.6, after enabling auth.http_auth (HTTP authentication), when a client connects to the broker using MQTT CONNECT without providing username/password, and the configuration params uses the placeholders %u / %P (e.g., username="%u", password="%P"), the HTTP request construction phase enters auth_http.c:set_data(). This results in calling strlen() on a NULL pointer, causing a SIGSEGV crash. This crash can be triggered remotely, resulting in a denial of service. This issue has been patched in version 0.24.7.
References
security-advisories@github.comhttps://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a8bPatch
security-advisories@github.comhttps://github.com/nanomq/NanoNNG/pull/1394Issue Tracking, Patch
security-advisories@github.comhttps://github.com/nanomq/nanomq/releases/tag/0.24.7Product, Release Notes
security-advisories@github.comhttps://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3pExploit, Vendor Advisory
Impacted products
Vendor Product Version
emqx nanomq *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2EB20A7D-1CAC-4435-809D-E28F44298077",
              "versionEndExcluding": "0.24.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In NanoMQ version 0.24.6, after enabling auth.http_auth (HTTP authentication), when a client connects to the broker using MQTT CONNECT without providing username/password, and the configuration params uses the placeholders %u / %P (e.g., username=\"%u\", password=\"%P\"), the HTTP request construction phase enters auth_http.c:set_data(). This results in calling strlen() on a NULL pointer, causing a SIGSEGV crash. This crash can be triggered remotely, resulting in a denial of service. This issue has been patched in version 0.24.7."
    },
    {
      "lang": "es",
      "value": "NanoMQ MQTT Broker (NanoMQ) es una plataforma de mensajer\u00eda Edge integral. En la versi\u00f3n 0.24.6 de NanoMQ, despu\u00e9s de habilitar auth.http_auth (autenticaci\u00f3n HTTP), cuando un cliente se conecta al broker usando MQTT CONNECT sin proporcionar nombre de usuario/contrase\u00f1a, y los par\u00e1metros de configuraci\u00f3n usan los marcadores de posici\u00f3n %u / %P (por ejemplo, username=\u0027%u\u0027, password=\u0027%P\u0027), la fase de construcci\u00f3n de la solicitud HTTP entra en auth_http.c:set_data(). Esto resulta en la llamada a strlen() sobre un puntero NULL, causando un fallo SIGSEGV. Este fallo puede ser activado remotamente, resultando en una denegaci\u00f3n de servicio. Este problema ha sido parcheado en la versi\u00f3n 0.24.7."
    }
  ],
  "id": "CVE-2026-32696",
  "lastModified": "2026-04-13T14:07:31.690",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 3.1,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "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": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-30T21:17:09.603",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a8b"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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        "Patch"
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      "url": "https://github.com/nanomq/NanoNNG/pull/1394"
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    {
      "source": "security-advisories@github.com",
      "tags": [
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        "Release Notes"
      ],
      "url": "https://github.com/nanomq/nanomq/releases/tag/0.24.7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3p"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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