| Package | Affected versions | Patched versions |
|---|---|---|
| elasticsearch | ≥ 8.19.0, < 8.19.20≥ 9.4.0, < 9.4.5≥ 9.5.0, < 9.5.1 | 8.19.209.4.59.5.1 |
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.
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