{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "7.0"
              },
              {
                "last_affected": "7.0"
              },
              {
                "introduced": "7.1"
              },
              {
                "last_affected": "7.1"
              },
              {
                "introduced": "7.2"
              },
              {
                "last_affected": "7.2"
              },
              {
                "introduced": "7.3"
              },
              {
                "last_affected": "7.3"
              },
              {
                "introduced": "7.4"
              },
              {
                "last_affected": "7.4"
              },
              {
                "introduced": "7.5"
              },
              {
                "last_affected": "7.5"
              },
              {
                "introduced": "7.6"
              },
              {
                "last_affected": "7.6"
              },
              {
                "introduced": "7.7"
              },
              {
                "last_affected": "7.7"
              },
              {
                "introduced": "7.8"
              },
              {
                "last_affected": "7.8"
              },
              {
                "introduced": "7.9"
              },
              {
                "last_affected": "7.9"
              },
              {
                "introduced": "7.10"
              },
              {
                "last_affected": "7.10"
              },
              {
                "introduced": "7.11"
              },
              {
                "last_affected": "7.11"
              },
              {
                "introduced": "7.12"
              },
              {
                "last_affected": "7.12"
              },
              {
                "introduced": "7.13"
              },
              {
                "last_affected": "7.13"
              },
              {
                "introduced": "7.14"
              },
              {
                "last_affected": "7.14"
              },
              {
                "introduced": "7.15"
              },
              {
                "last_affected": "7.15"
              },
              {
                "introduced": "7.16"
              },
              {
                "last_affected": "7.16"
              },
              {
                "introduced": "7.17"
              },
              {
                "last_affected": "7.17"
              },
              {
                "introduced": "7.18"
              },
              {
                "last_affected": "7.18"
              },
              {
                "introduced": "7.19"
              },
              {
                "last_affected": "7.19"
              },
              {
                "introduced": "7.20"
              },
              {
                "last_affected": "7.20"
              },
              {
                "introduced": "7.21"
              },
              {
                "last_affected": "7.21"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "54250f5fbfa1972b96ef593b457abd6184ea65a0"
            },
            {
              "fixed": "a9df523f76f43a38bd53b4232b9cfd4c16869e71"
            },
            {
              "fixed": "beb73a65a99619ff349c59037ea5197f27c7e533"
            }
          ],
          "repo": "https://github.com/cesanta/mongoose",
          "type": "GIT"
        }
      ],
      "versions": [
        "7.0",
        "7.1",
        "7.10",
        "7.11",
        "7.12",
        "7.13",
        "7.14",
        "7.15",
        "7.16",
        "7.17",
        "7.18",
        "7.19",
        "7.2",
        "7.20",
        "7.21",
        "7.3",
        "7.4",
        "7.5",
        "7.6",
        "7.7",
        "7.8",
        "7.9"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulDB",
    "cwe_ids": [
      "CWE-119",
      "CWE-121"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101003.json"
  },
  "details": "A weakness has been identified in Cesanta Mongoose up to 7.21. Affected by this vulnerability is the function fn of the file tutorials/mqtt/mqtt-server/main.c of the component MQTT Broker. Executing a manipulation can lead to stack-based buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.22 addresses this issue. This patch is called a9df523f76f43a38bd53b4232b9cfd4c16869e71. Upgrading the affected component is advised.",
  "id": "CVE-2026-101003",
  "modified": "2026-09-30T03:31:04.764683111Z",
  "published": "2026-09-28T05:30:14.021Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cesanta/mongoose/"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101003.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101003"
    },
    {
      "type": "ADVISORY",
      "url": "https://vuldb.com/cve/CVE-2026-101003"
    },
    {
      "type": "ADVISORY",
      "url": "https://vuldb.com/submit/920005"
    },
    {
      "type": "ADVISORY",
      "url": "https://vuldb.com/vuln/410873"
    },
    {
      "type": "REPORT",
      "url": "https://vuldb.com/vuln/410873/cti"
    },
    {
      "type": "FIX",
      "url": "https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71"
    },
    {
      "type": "FIX",
      "url": "https://github.com/cesanta/mongoose/releases/tag/7.22"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cesanta Mongoose MQTT Broker main.c fn stack-based overflow"
}