{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.8.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "c378e1f95a58498ad41c4c99f39e2072b2629085"
            },
            {
              "fixed": "aa72a9818a045ad4e290a5eb9be59e025b90634d"
            }
          ],
          "repo": "https://github.com/opensearch-project/opensearch-dashboards",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xmqx-xq2p-8jq2"
  ],
  "database_specific": {
    "cna_assigner": "AMZN",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18420.json"
  },
  "details": "Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards allows an authenticated remote user to execute arbitrary code on the server via a crafted JSON payload to the metrics visualization API endpoint. This issue is a form of prototype pollution that enables remote code execution. \n\n\n\nTo remediate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later.",
  "id": "CVE-2026-18420",
  "modified": "2026-08-22T03:31:19.605820301Z",
  "published": "2026-08-20T20:40:40.709Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-085-aws/"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18420.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/opensearch-project/OpenSearch-Dashboards/security/advisories/GHSA-xmqx-xq2p-8jq2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18420"
    },
    {
      "type": "FIX",
      "url": "https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.8.0"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "RCE via Prototype Pollution in OpenSearch Dashboards"
}