FKIE_CVE-2026-32134

Vulnerability from fkie_nvd - Published: 2026-05-19 18:16 - Updated: 2026-05-19 21:08
Severity
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/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 versions 0.24.10 and below, when NanoMQ handles high-concurrency reconnect traffic using a reconnect-collision payload, the broker can crash due to a NULL pointer dereference during MQTT session resumption for clean_start=0 clients. The transport's p_peer callback (tcptran_pipe_peer()) iterates cpipe->subinfol while copying session metadata from the cached old pipe to the new reconnecting pipe, without checking whether the pointer is NULL. Under a reconnect race, cpipe->subinfol can be freed and set to NULL before session restore invokes this function, resulting in a remote unauthenticated Denial-of-Service (process crash) condition. This issue has been fixed in version 0.24.11.
References
security-advisories@github.comhttps://github.com/nanomq/NanoNNG/commit/522ec62e29e60d1122f2aedaa6e702dcf089f7bb
security-advisories@github.comhttps://github.com/nanomq/nanomq/issues/2241
security-advisories@github.comhttps://github.com/nanomq/nanomq/releases/tag/0.24.11
security-advisories@github.comhttps://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/nanomq/nanomq/issues/2241
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In versions 0.24.10 and below, when NanoMQ handles high-concurrency reconnect traffic using a reconnect-collision payload, the broker can crash due to a NULL pointer dereference during MQTT session resumption for clean_start=0 clients. The transport\u0027s p_peer callback (tcptran_pipe_peer()) iterates cpipe-\u003esubinfol while copying session metadata from the cached old pipe to the new reconnecting pipe, without checking whether the pointer is NULL. Under a reconnect race, cpipe-\u003esubinfol can be freed and set to NULL before session restore invokes this function, resulting in a remote unauthenticated Denial-of-Service (process crash) condition. This issue has been fixed in version 0.24.11."
    }
  ],
  "id": "CVE-2026-32134",
  "lastModified": "2026-05-19T21:08:09.430",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "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:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-19T18:16:21.147",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/NanoNNG/commit/522ec62e29e60d1122f2aedaa6e702dcf089f7bb"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/nanomq/issues/2241"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/nanomq/releases/tag/0.24.11"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/nanomq/nanomq/issues/2241"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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