medium6.5
CVE-2026-72687
A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier.
Impact
A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier. Elasticsearch decodes and deserializes the identifier before confirming that it was legitimately issued by the cluster, and a size value carried inside the identifier drives an allocation that is neither capped nor accounted for by the available memory-usage controls. The resulting out-of-memory condition is fatal and terminates the affected node process, resulting in a denial of service.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Elastic | Elasticsearch | from 8.0.0 before 8.19.20 from 9.0.0 before 9.4.5 from 9.5.0 before 9.5.1 |