{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "5.0.0"
              },
              {
                "last_affected": "5.0.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0dd6943057f3fa9a425ea3e1d5e6bd23f5840fd9"
            },
            {
              "last_affected": "0dd6943057f3fa9a425ea3e1d5e6bd23f5840fd9"
            }
          ],
          "repo": "https://github.com/freertos/coremqtt",
          "type": "GIT"
        }
      ],
      "versions": [
        "5.0.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-6qh9-r6jp-2wxc"
  ],
  "database_specific": {
    "cna_assigner": "AMZN",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8686.json"
  },
  "details": "Missing bounds validation in the MQTT v5.0 property parser in coreMQTT before 5.0.1 allows an MQTT broker to cause a denial of service by sending a crafted packet.\n\n\n\nTo remediate this issue, users should upgrade to v5.0.1.",
  "id": "CVE-2026-8686",
  "modified": "2026-08-04T11:31:02.918439830Z",
  "published": "2026-05-15T18:38:10.651Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-032-aws/"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8686.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8686"
    },
    {
      "type": "FIX",
      "url": "https://github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "DoS from MQTT v5.0 Deserialization Fault in core MQTT"
}