Elasticsearch ML Request DOS via CVE-2026-56149 (CWE-770)
CVE-2026-56149 Published on July 1, 2026
Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service
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.
Vulnerability Analysis
CVE-2026-56149 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-56149
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Affected Versions
Elasticsearch:- Version 9.4.0, <= 9.4.2 is affected.
- Version 9.0.0, <= 9.3.5 is affected.
- Version 8.0.0, <= 8.19.16 is affected.