CVE-2026-72678

{"id": "CVE-2026-72678", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72678", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-13T20:23:21.261336Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@elastic.co", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@elastic.co", "affectedData": [{"vendor": "Elastic", "product": "Elasticsearch", "versions": [{"status": "affected", "version": "8.19.0", "versionType": "semver", "lessThanOrEqual": "8.19.19"}, {"status": "affected", "version": "9.4.0", "versionType": "semver", "lessThanOrEqual": "9.4.4"}, {"status": "affected", "version": "9.5.0", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-13T20:17:28.497", "references": [{"url": "https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-80/389507", "tags": ["Vendor Advisory"], "source": "security@elastic.co"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@elastic.co", "description": [{"lang": "en", "value": "CWE-789"}]}], "descriptions": [{"lang": "en", "value": "Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node."}], "lastModified": "2026-09-01T15:28:17.610", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "04A4B6FB-C74F-4992-B078-CF38D80D479E", "versionEndExcluding": "8.19.20", "versionStartIncluding": "8.19.0"}, {"criteria": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8FD2AE26-F6B1-49F7-B664-F3A530C25E8E", "versionEndExcluding": "9.4.5", "versionStartIncluding": "9.4.0"}, {"criteria": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F1756783-CC37-488F-A612-4F3AF793F575", "versionEndExcluding": "9.5.1", "versionStartIncluding": "9.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@elastic.co"}