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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54412",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-15T17:01:08.771614Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-15T17:01:16.924Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/LiamBindle/MQTT-C",
          "defaultStatus": "unknown",
          "product": "MQTT-C",
          "programFiles": [
            "src/mqtt.c"
          ],
          "programRoutines": [
            {
              "name": "mqtt_unpack_publish_response"
            }
          ],
          "repo": "https://github.com/LiamBindle/MQTT-C",
          "vendor": "LiamBindle",
          "versions": [
            {
              "lessThan": "1.1.7",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "1.1.7",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Saidakbarxon Maxsudxonov"
        }
      ],
      "datePublic": "2026-06-14T17:26:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eLiamBindle MQTT-C versions prior to 1.1.7 contain a heap-based out-of-bounds read and integer underflow in the mqtt_unpack_publish_response() function in src/mqtt.c. A remote unauthenticated attacker controlling an MQTT broker, or capable of injecting MQTT traffic into an unencrypted session, can crash a subscribed MQTT-C client and potentially disclose adjacent heap memory by sending a single crafted PUBLISH packet.\u003c/p\u003e"
            }
          ],
          "value": "LiamBindle MQTT-C versions prior to 1.1.7 contain a heap-based out-of-bounds read and integer underflow in the mqtt_unpack_publish_response() function in src/mqtt.c. A remote unauthenticated attacker controlling an MQTT broker, or capable of injecting MQTT traffic into an unencrypted session, can crash a subscribed MQTT-C client and potentially disclose adjacent heap memory by sending a single crafted PUBLISH packet."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A remote attacker controlling an MQTT broker, or able to inject one PUBLISH packet into an unencrypted MQTT session to which a victim has subscribed, can crash a subscribed MQTT-C client by sending a crafted PUBLISH packet whose topic_name_size exceeds the remaining_length field. The vulnerable client advances the parse pointer into unmapped heap memory, causing an out-of-bounds read that may expose adjacent heap bytes. It then calculates application_message_size using unsigned subtraction, causing an integer underflow to a value near 2^32, and passes that value to memmove(), crashing the process. IoT and embedded devices using MQTT-C with shared, untrusted, or compromised brokers are exposed to unauthenticated denial of service."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "exploitMaturity": "PROOF_OF_CONCEPT",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "DIFFUSE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y/V:D",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "A malicious MQTT broker, or a network attacker capable of injecting a single MQTT PUBLISH packet into an unencrypted session to which the victim client has subscribed, sends a crafted packet with topic_name_size = 0xFFFF and remaining_length = 7 to crash an MQTT-C-based client process and potentially disclose adjacent heap bytes."
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
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          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-191",
              "description": "CWE-191 Integer Underflow (Wrap or Wraparound)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-05T12:44:48.838Z",
        "orgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "shortName": "TuranSec"
      },
      "references": [
        {
          "name": "LiamBindle/MQTT-C upstream repository",
          "tags": [
            "product"
          ],
          "url": "https://github.com/LiamBindle/MQTT-C"
        },
        {
          "name": "Vulnerable mqtt_unpack_publish_response() in src/mqtt.c (v1.1.6)",
          "tags": [
            "product"
          ],
          "url": "https://github.com/LiamBindle/MQTT-C/blob/v1.1.6/src/mqtt.c#L1334"
        },
        {
          "name": "Fix out-of-bounds read and integer underflow in PUBLISH parsing",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/LiamBindle/MQTT-C/pull/208"
        },
        {
          "name": "MQTT-C v1.1.7 release",
          "tags": [
            "release-notes",
            "patch"
          ],
          "url": "https://github.com/LiamBindle/MQTT-C/releases/tag/v1.1.7"
        },
        {
          "name": "CWE-125: Out-of-bounds Read",
          "tags": [
            "technical-description"
          ],
          "url": "https://cwe.mitre.org/data/definitions/125.html"
        },
        {
          "name": "CWE-191: Integer Underflow (Wrap or Wraparound)",
          "tags": [
            "technical-description"
          ],
          "url": "https://cwe.mitre.org/data/definitions/191.html"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "MQTT-C Heap Out-of-Bounds Read and Integer Underflow in mqtt_unpack_publish_response()",
      "x_assigner_notes": "The vulnerable mqtt_unpack_publish_response() implementation was verified at the v1.1.6 release tag. The function performs a remaining_length \u003e= 4 fixed-header sanity check but trusts the broker-controlled 16-bit topic_name_size field as a pointer offset and as a subtrahend in the unsigned application_message_size calculation. This can result in an out-of-bounds read and integer underflow, followed by a potentially oversized memmove() operation and process crash. The upstream fix is referenced in PR #208 and MQTT-C v1.1.7 release notes. Versions prior to 1.1.7 are affected; version 1.1.7 is considered unaffected. Mitigation: validate that topic_name_size + 2 + (qos_level \u003e 0 ? 2 : 0) does not exceed remaining_length before using topic_name_size as a pointer offset or subtrahend, or migrate to a maintained MQTT client library such as Eclipse Paho MQTT C or libmosquitto.",
      "x_author": "Saidakbarxon Maxsudxonov",
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
    "assignerShortName": "TuranSec",
    "cveId": "CVE-2026-54412",
    "datePublished": "2026-06-14T17:26:36.740Z",
    "dateReserved": "2026-06-13T16:39:46.122Z",
    "dateUpdated": "2026-11-05T12:44:48.838Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}