CVE-2026-72656
Medium
Description
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 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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Elasticsearch
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-789CWE-789
How to fix
Update
- elastic elasticsearch8.18.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| elastic elasticsearch | 8.11.0 ≤ v < 8.18.0 | 8.18.0 |
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