What’s Vulnerable › Vulnerabilities
CVE-2026-63136: Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-21 · updated 2026-10-24
- Weakness: CWE-400
Description
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
- Elasticsearch: from 8.0.0 before 8.19.15; from 9.0.0 before 9.2.9; from 9.3.0 before 9.3.4 — fixed in 8.19.15, 9.2.9, 9.3.4
How to fix
Upgrade to a fixed version: Elasticsearch 8.19.15, 9.2.9, 9.3.4. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-63136 or the next vulnerability affects your stack