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        "cveId": "CVE-2026-18420",
        "assignerOrgId": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "state": "PUBLISHED",
        "assignerShortName": "AMZN",
        "dateReserved": "2026-07-30T18:11:08.464Z",
        "datePublished": "2026-08-20T20:40:40.709Z",
        "dateUpdated": "2026-08-20T20:40:40.709Z"
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                "dateUpdated": "2026-08-20T20:40:40.709Z"
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            "title": "RCE via Prototype Pollution in OpenSearch Dashboards",
            "problemTypes": [
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                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-1321",
                            "description": "CWE-1321 Improperly controlled modification of object prototype attributes ('prototype pollution')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-586",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-586 Object Injection"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "AWS",
                    "product": "Amazon OpenSearch Service",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "3.0.0",
                            "lessThan": "3.8.0",
                            "versionType": "custom"
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                    "vendor": "OpenSearch",
                    "product": "OpenSearch Dashboards",
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                            "status": "affected",
                            "version": "3.0.0",
                            "lessThan": "3.8.0",
                            "versionType": "custom"
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                                    "versionEndExcluding": "3.8.0"
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                {
                    "lang": "en",
                    "value": "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.",
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            ],
            "references": [
                {
                    "url": "https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.8.0",
                    "tags": [
                        "patch"
                    ]
                },
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                    "url": "https://github.com/opensearch-project/OpenSearch-Dashboards/security/advisories/GHSA-xmqx-xq2p-8jq2",
                    "tags": [
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                {
                    "url": "https://aws.amazon.com/security/security-bulletins/2026-085-aws/",
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                        "scope": "UNCHANGED",
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                        "vulnConfidentialityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
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