CVE-2026-56145: Elastic Elasticsearch

Medium severity, CVSS 6.5. EPSS: 0.5% 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 low-privileged authenticated user with permission to execute EQL sequence queries against an index they control can send a specially crafted query that triggers excessive memory consumption, causing the Elasticsearch node to crash.

Affected products

• Elastic Elasticsearch: from 8.0.0, before 8.19.18 (fixed in 8.19.18); from 9.0.0, before 9.3.7 (fixed in 9.3.7); from 9.4.0, before 9.4.4 (fixed in 9.4.4)

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