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CVE-2026-56149— Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service

Quick assessment

Affected
Elastic Elasticsearch
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic Elasticsearch是荷兰Elastic公司开源的一个搜索分析引擎。 Elastic Elasticsearch存在资源管理错误漏洞，该漏洞源于资源无限制分配或节流问题，可能导致权限高的用户提交特制机器学习请求，引起过度内存消耗，可能导致受影响节点不可用，从而导致拒绝服务攻击。以下版本受到影响：9.4.2及之前版本、9.3.5及之前版本和8.19.16及之前版本。

CVSS 4.9 · Medium EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
Elastic Elasticsearch 9.4.0≤ 9.4.2 affected
9.0.0≤ 9.3.5 affected
8.0.0≤ 8.19.16 affected
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I. Basic Information for CVE-2026-56149

Vulnerability Information
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Vulnerability Title
Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Elasticsearch 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Elasticsearch是荷兰Elastic公司开源的一个搜索分析引擎。 Elastic Elasticsearch存在资源管理错误漏洞，该漏洞源于资源无限制分配或节流问题，可能导致权限高的用户提交特制机器学习请求，引起过度内存消耗，可能导致受影响节点不可用，从而导致拒绝服务攻击。以下版本受到影响：9.4.2及之前版本、9.3.5及之前版本和8.19.16及之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Elasticsearch 9.4.0 ~ 9.4.2 -

II. Public POCs for CVE-2026-56149

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III. Intelligence Information for CVE-2026-56149

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Vendor Advisories for CVE-2026-56149 (1)

Same Patch Batch · Elastic · 2026-07-01 · 9 CVEs total

CVE-2026-49091 8.0 HIGH Improper Output Neutralization for Logs in Kibana Leading to Log Injection
CVE-2026-49090 6.5 MEDIUM Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
CVE-2026-49087 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-56150 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Fleet Server Leading to Denial of
CVE-2026-56148 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-56151 6.5 MEDIUM Improper Input Validation in Kibana Leading to Denial of Service
CVE-2026-56152 5.3 MEDIUM Incorrect Authorization in Kibana Leading to Information Disclosure
CVE-2026-49088 4.4 MEDIUM Insertion of Sensitive Information into Log File in Kibana Leading to Information Disclosu

IV. Related Vulnerabilities

Same product: Elasticsearch
Same vendor: Elastic
Same weakness: CWE-770

V. Comments for CVE-2026-56149

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