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CVE-2026-72639— Memory Allocation with Excessive Size Value in Elasticsearch Highlighting 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.

Elasticsearch是荷兰Elastic公司开源的一款分布式搜索与分析引擎。 Elastic Elasticsearch 8.19.0版本至8.19.19版本和9.3.0版本至9.5.0版本存在资源管理错误漏洞，该漏洞源于未对用户提供的搜索高亮选项计数设置上限，且分配未计入任何熔断器，可能导致内存耗尽并引发致命错误，造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.29% · P22

Affected Version Matrix 2

VendorProduct Version RangeStatus
Elastic Elasticsearch 8.19.0≤ 8.19.19 affected
9.3.0≤ 9.5.0 affected
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I. Basic Information for CVE-2026-72639

Vulnerability Information
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Vulnerability Title
Memory Allocation with Excessive Size Value in Elasticsearch Highlighting Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting option, and the allocation derived from that count is not accounted against any circuit breaker. An authenticated user holding only read privileges on a single searchable index can submit one small search request that causes the node to reserve an excessively large internal data structure. The allocation occurs before the existing highlighting safety limits are evaluated, so memory exhaustion raises a fatal error that terminates the Elasticsearch node process. This results in a denial of service for the affected node and degrades cluster routing and health. The defect is not volumetric and does not depend on the size of the indexed data, so a single request is sufficient.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
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
Elasticsearch是荷兰Elastic公司开源的一款分布式搜索与分析引擎。 Elastic Elasticsearch 8.19.0版本至8.19.19版本和9.3.0版本至9.5.0版本存在资源管理错误漏洞，该漏洞源于未对用户提供的搜索高亮选项计数设置上限，且分配未计入任何熔断器，可能导致内存耗尽并引发致命错误，造成拒绝服务。
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 8.19.0 ~ 8.19.19 -

II. Public POCs for CVE-2026-72639

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III. Intelligence Information for CVE-2026-72639

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Vendor Advisories for CVE-2026-72639 (1)

Same Patch Batch · Elastic · 2026-08-13 · 48 CVEs total

CVE-2026-72642 8.8 HIGH Use of Out-of-range Pointer Offset in the Elasticsearch Machine Learning Native Inference
CVE-2026-72665 8.1 HIGH Missing Authorization in Kibana Leading to Unauthorized Execution of Host Response Actions
CVE-2026-72670 7.7 HIGH Exposure of Sensitive Information to an Unauthorized Actor in Kibana Leading to Disclosure
CVE-2026-72672 7.7 HIGH Incorrect Authorization in Kibana Leading to Disclosure of Elastic Defend Endpoint Event D
CVE-2026-72669 7.6 HIGH Missing Authorization in Kibana Leading to Cross-User Information Disclosure and Data Tamp
CVE-2026-72658 7.3 HIGH Cross-Site Request Forgery in Kibana Leading to Privilege Escalation
CVE-2026-72677 7.3 HIGH Relative Path Traversal in Kibana Fleet Leading to Unauthorized Deletion of Users and Othe
CVE-2026-72675 7.1 HIGH Missing Authorization in Kibana Machine Learning Leading to Cross-Space Information Disclo
CVE-2026-72629 7.1 HIGH Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Space Access t
CVE-2026-72632 7.1 HIGH Observable Discrepancy in Kibana Fleet Leading to Disclosure of Elastic Agent Elasticsearc
CVE-2026-72630 7.1 HIGH Incorrect Authorization in Kibana Fleet Leading to Privilege Escalation
CVE-2026-72643 7.1 HIGH Incorrect Authorization in Kibana Agent Builder Leading to Disclosure and Tampering of Pri
CVE-2026-72666 6.8 MEDIUM Authorization Bypass Through User-Controlled Key in Kibana Leading to Unauthorized Query E
CVE-2026-72631 6.5 MEDIUM Improper Privilege Management in Kibana Fleet Leading to Over-Scoped Elastic Agent API Key
CVE-2026-72661 6.5 MEDIUM Missing Authorization in Kibana Leading to Information Disclosure
CVE-2026-49089 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-72684 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of
CVE-2026-72663 6.5 MEDIUM Inefficient Algorithmic Complexity in Kibana Leading to Denial of Service
CVE-2026-72636 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Wildcard Matching Leading to Denial of Service
CVE-2026-72657 6.5 MEDIUM Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Di

Showing top 20 of 48 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Elasticsearch
Same vendor: Elastic
Same weakness: CWE-789

V. Comments for CVE-2026-72639

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