CVE-2026-56143: Elastic Elasticsearch

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a denial of service via Excessive Allocation (CAPEC-130). A user with elevated privileges can submit a specially crafted request that causes excessive memory consumption, which may render the affected node unavailable.

Affected products

• Elastic Elasticsearch: from 8.0.0, before 8.19.20 (fixed in 8.19.20); from 9.0.0, before 9.3.0 (fixed in 9.3.0)

Published 2026-09-01. Last modified 2026-09-04.