{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "8.0.0"
              },
              {
                "fixed": "8.19.19"
              },
              {
                "introduced": "9.0.0"
              },
              {
                "fixed": "9.3.8"
              },
              {
                "introduced": "9.4.0"
              },
              {
                "fixed": "9.4.4"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "1b6a7ece17463df5ff54a3e1302d825889aa1161"
            },
            {
              "fixed": "0b6bd198d583b8566336c0db61afb70b346c6882"
            },
            {
              "introduced": "112859b85d50de2a7e63f73c8fc70b99eea24291"
            },
            {
              "fixed": "171dd53e53c29b91f45d2d87857a3f74db48cca5"
            },
            {
              "introduced": "2e8528e92361c3399724226deaf2b46f933e925b"
            },
            {
              "fixed": "77cd231096e56b56ac1d24445a9430a252622e6d"
            }
          ],
          "repo": "https://github.com/elastic/elasticsearch",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "elastic",
    "cwe_ids": [
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63263.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "9.4.0"
          },
          {
            "last_affected": "9.4.3"
          },
          {
            "introduced": "9.0.0"
          },
          {
            "last_affected": "9.3.7"
          },
          {
            "introduced": "8.0.0"
          },
          {
            "last_affected": "8.19.18"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Exponential Data Expansion (CAPEC-197). An authenticated user may submit a specially crafted query to the ES|QL engine that causes exponential CPU consumption during query evaluation. Because the resource exhaustion persists beyond query completion, repeated requests can fully exhaust the available query worker resources, rendering ES|QL queries unavailable until the node is restarted.",
  "id": "CVE-2026-63263",
  "modified": "2026-08-05T03:30:26.339773872Z",
  "published": "2026-07-21T23:10:49.155Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-74/388577"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63263.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63263"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service"
}