{
  "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-2026-102408",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-102408",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-06T19:31:39.196Z",
    "updatedAt": "2026-10-06T19:56:06.441Z",
    "importedAt": "2026-10-24T01:57:50.502Z",
    "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": "Inefficient Regular Expression Complexity in Elasticsearch Leading to Denial of Service",
      "summary": "Inefficient Regular Expression Complexity (CWE-1333) in Elasticsearch can lead to denial of service via Regular Expression Exponential Blowup (CAPEC-492). The ES|QL CHUNK function's recursive chunking strategy accepts a list of user-supplied regular expressions used as text-splitting separators, without validating their computational complexity or bounding their execution time. An authenticated user with read access to any text-based index can submit a specially crafted regular expression that triggers catastrophic backtracking, consuming excessive CPU on Elasticsearch worker threads and degrading query throughput for other tenants on the affected node. The cluster does not crash as a result of this issue.",
      "affected": [
        {
          "vendor": "Elastic",
          "product": "Elasticsearch",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8.19.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "8.19.21"
            },
            {
              "version": "9.1.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "9.3.8"
            },
            {
              "version": "9.4.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "9.4.7"
            },
            {
              "version": "9.5.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "9.5.4"
            }
          ]
        }
      ]
    }
  }
}