CVE-2026-63136: Elastic Elasticsearch

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). A user with search privileges can submit a specially crafted search request that causes a data node to exhaust available heap memory, resulting in node unavailability and cluster degradation. An attacker could leverage this vulnerability to cause cluster downtime requiring manual intervention to restore service.

Affected products

• Elastic Elasticsearch: from 8.0.0, before 8.19.15 (fixed in 8.19.15); from 9.0.0, before 9.2.9 (fixed in 9.2.9); from 9.3.0, before 9.3.4 (fixed in 9.3.4)

Published 2026-07-21. Last modified 2026-08-07.