{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2025-66168",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-66168",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2026-03-04T08:45:00.932Z",
    "updatedAt": "2026-04-10T10:52:27.564Z",
    "importedAt": "2026-10-24T01:57:44.935Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Apache ActiveMQ, Apache ActiveMQ All Module, Apache ActiveMQ MQTT Module: MQTT control packet remaining length field is not properly validated",
      "summary": "WARNING:\n\nUsers of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases.\n\nSee the  following for more details:\n https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt \n https://www.cve.org/CVERecord?id=CVE-2026-40046 \n\n\n\nOriginal Report:\n\nApache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets. When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes the broker susceptible to unexpected behavior when interacting with non-compliant clients. This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes. The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.\n\nThis issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0\n\nUsers are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.",
      "affected": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache ActiveMQ",
          "packageName": "org.apache.activemq:apache-activemq",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.19.2"
            },
            {
              "version": "6.0.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.9"
            },
            {
              "version": "6.2.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.2.1"
            }
          ]
        },
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache ActiveMQ All Module",
          "packageName": "org.apache.activemq:activemq-all",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.19.2"
            },
            {
              "version": "6.0.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.9"
            },
            {
              "version": "6.2.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.2.1"
            }
          ]
        },
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache ActiveMQ MQTT Module",
          "packageName": "org.apache.activemq:activemq-mqtt",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.19.2"
            },
            {
              "version": "6.0.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.9"
            },
            {
              "version": "6.2.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.2.1"
            }
          ]
        }
      ]
    }
  }
}