CVE-2026-61633 (GCVE-0-2026-61633)
Vulnerability from cvelistv5
Published
2026-09-18 16:18
Modified
2026-09-18 17:26
Severity ?
2.0 (Low) - CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
CWE
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Summary
NanoMQ is an MQTT broker. Prior to 0.24.14, the NanoMQ client function nni_mqtt_msg_decode_unsubscribe() in nng/src/supplemental/mqtt/mqtt_codec.c does not handle a failed read_uint16() while counting topics in a malformed UNSUBSCRIBE packet. A zero-length topic followed by trailing data can leave buf.curpos unchanged while topic_count continues to increase, allowing a malicious MQTT broker to hang a connecting MQTT 3.1.1 client, consume CPU and memory, and repeatedly deny service when automatic reconnection is enabled. The broker-side nmq_unsubinfo_decode path is not affected. This issue is fixed in version 0.24.14.
References
Impacted products
Vendor Product Version
nanomq nanomq Version: < 0.24.14
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-61633",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-18T17:26:25.126842Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-18T17:26:49.956Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nanomq",
          "vendor": "nanomq",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.24.14"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NanoMQ is an MQTT broker. Prior to 0.24.14, the NanoMQ client function nni_mqtt_msg_decode_unsubscribe() in nng/src/supplemental/mqtt/mqtt_codec.c does not handle a failed read_uint16() while counting topics in a malformed UNSUBSCRIBE packet. A zero-length topic followed by trailing data can leave buf.curpos unchanged while topic_count continues to increase, allowing a malicious MQTT broker to hang a connecting MQTT 3.1.1 client, consume CPU and memory, and repeatedly deny service when automatic reconnection is enabled. The broker-side nmq_unsubinfo_decode path is not affected. This issue is fixed in version 0.24.14."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 2,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-835",
              "description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T16:18:57.029Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr"
        },
        {
          "name": "https://github.com/nanomq/NanoNNG/pull/1518",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nanomq/NanoNNG/pull/1518"
        },
        {
          "name": "https://github.com/nanomq/NanoNNG/commit/fa8d859bb39841e46cfc6cce280d242bd782ad3d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nanomq/NanoNNG/commit/fa8d859bb39841e46cfc6cce280d242bd782ad3d"
        },
        {
          "name": "https://github.com/nanomq/nanomq/releases/tag/0.24.14",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nanomq/nanomq/releases/tag/0.24.14"
        }
      ],
      "source": {
        "advisory": "GHSA-m7mp-rr3v-hmhr",
        "discovery": "UNKNOWN"
      },
      "title": "NanoMQ: Infinite Loop in UNSUBSCRIBE Decoder Leading to Remote DoS"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61633",
    "datePublished": "2026-09-18T16:18:57.029Z",
    "dateReserved": "2026-07-10T17:38:57.111Z",
    "dateUpdated": "2026-09-18T17:26:49.956Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-61633\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-18T17:26:25.126842Z\"}}}], \"references\": [{\"url\": \"https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-18T17:26:42.861Z\"}}], \"cna\": {\"title\": \"NanoMQ: Infinite Loop in UNSUBSCRIBE Decoder Leading to Remote DoS\", \"source\": {\"advisory\": \"GHSA-m7mp-rr3v-hmhr\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"nanomq\", \"product\": \"nanomq\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 0.24.14\"}]}], \"references\": [{\"url\": \"https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr\", \"name\": \"https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/nanomq/NanoNNG/pull/1518\", \"name\": \"https://github.com/nanomq/NanoNNG/pull/1518\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/nanomq/NanoNNG/commit/fa8d859bb39841e46cfc6cce280d242bd782ad3d\", \"name\": \"https://github.com/nanomq/NanoNNG/commit/fa8d859bb39841e46cfc6cce280d242bd782ad3d\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/nanomq/nanomq/releases/tag/0.24.14\", \"name\": \"https://github.com/nanomq/nanomq/releases/tag/0.24.14\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"NanoMQ is an MQTT broker. Prior to 0.24.14, the NanoMQ client function nni_mqtt_msg_decode_unsubscribe() in nng/src/supplemental/mqtt/mqtt_codec.c does not handle a failed read_uint16() while counting topics in a malformed UNSUBSCRIBE packet. A zero-length topic followed by trailing data can leave buf.curpos unchanged while topic_count continues to increase, allowing a malicious MQTT broker to hang a connecting MQTT 3.1.1 client, consume CPU and memory, and repeatedly deny service when automatic reconnection is enabled. The broker-side nmq_unsubinfo_decode path is not affected. This issue is fixed in version 0.24.14.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-835\", \"description\": \"CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-09-18T16:18:57.029Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-61633\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-18T17:26:49.956Z\", \"dateReserved\": \"2026-07-10T17:38:57.111Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-09-18T16:18:57.029Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.