What’s Vulnerable › Vulnerabilities
CVE-2026-56149: Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service
- Severity: medium (CVSS 4.9 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: 2026-07-01 · updated 2026-10-25
- Weakness: CWE-770
Description
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 machine learning request that causes excessive memory consumption, which may render the affected node unavailable.
Affected products
- Elasticsearch: from 8.0.0 before 8.19.17; from 9.0.0 before 9.3.6; from 9.4.0 before 9.4.3 — fixed in 8.19.17, 9.3.6, 9.4.3
How to fix
Upgrade to a fixed version: Elasticsearch 8.19.17, 9.3.6, 9.4.3. Check the vendor advisory for mitigations.
References
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