Admin-triggered node outage via machine-learning memory exhaustion
Published Jul 1, 2026 · Updated Jul 1, 2026
Resource exhaustion in Elastic Elasticsearch allows remote authenticated users with elevated privileges to make an affected node unavailable. A specially crafted machine-learning request causes excessive memory consumption, although Elastic has not disclosed the request field or allocation path that lacks a limit. Only deployments using machine learning are exposed, and exploitation requires privileges to create or manage trained models; affected releases are 8.0.0 through 8.19.16, 9.0.0 through 9.3.5, and 9.4.0 through 9.4.2.
Summary
What happened
Resource exhaustion in Elastic Elasticsearch allows remote authenticated users with elevated privileges to make an affected node unavailable. A specially crafted machine-learning request causes excessive memory consumption, although Elastic has not disclosed the request field or allocation path that lacks a limit. Only deployments using machine learning are exposed, and exploitation requires privileges to create or manage trained models; affected releases are 8.0.0 through 8.19.16, 9.0.0 through 9.3.5, and 9.4.0 through 9.4.2.
The record
- CVE
- CVE-2026-56149
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Vendor
- Elastic
- Product
- Elasticsearch
- Classifications
- CWE-770, CAPEC-130, T1499.004
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jul 1, 2026CVE publishedPublication date reported by the CVE source.
- Jul 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=8.0.0 <=8.19.16
- Affected versionversion=9.0.0 <=9.3.5
- Affected versionversion=9.4.0 <=9.4.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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