{"id":"CVE-2026-72656","title":"Memory Allocation with Excessive Size Value (CWE-789) in the ES|QL query processing of Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130)","summary":"Memory Allocation with Excessive Size Value (CWE-789) in the ES|QL query processing of Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user able to submit ES|QL queries could send a spec…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-789"],"vendor":"elastic","product":"elasticsearch","affected":["elasticsearch >= 8.11.0, < 8.18.0"],"patched":["elasticsearch 8.18.0"],"published":"2026-08-13","updated":"2026-09-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72656","references":[{"url":"https://discuss.elastic.co/t/elasticsearch-8-18-0-9-0-0-security-update-esa-2026-111/389495","label":"security@elastic.co"}],"tags":["nvd"],"epss":0.0042,"epssPercentile":0.33591,"ingestedAt":"2026-09-05T18:43:14.245Z","slug":"CVE-2026-72656","body":"## Overview\n\nMemory Allocation with Excessive Size Value (CWE-789) in the ES|QL query processing of Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user able to submit ES|QL queries could send a specially crafted query whose evaluation allocates an unbounded amount of heap memory, exhausting the available heap on the receiving node and causing the node to become unavailable.\n\n## Affected\n\n- `elasticsearch >= 8.11.0, < 8.18.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `elasticsearch 8.18.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}