What’s Vulnerable › Vulnerabilities
CVE-2026-56145: 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: 0.5% 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 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
- Elasticsearch: from 8.0.0 before 8.19.18; from 9.0.0 before 9.3.7; from 9.4.0 before 9.4.4 — fixed in 8.19.18, 9.3.7, 9.4.4
How to fix
Upgrade to a fixed version: Elasticsearch 8.19.18, 9.3.7, 9.4.4. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-56145 or the next vulnerability affects your stack