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CVE-2026-103005— Memory Allocation with Excessive Size Value 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.

在 Elasticsearch 中，存在内存分配过量值（CWE-789）漏洞，可通过过度分配（CAPEC-130）导致拒绝服务。具备连接器管理权限的已认证用户，在创建并随后访问包含异常庞大 字段的连接器资源时，可促使集群分配不受控的大量内存，从而耗尽可用的堆内存，并导致受影响节点崩溃。

CVSS 6.5 · Medium

Affected Version Matrix 4

VendorProduct Version RangeStatus
Elastic Elasticsearch 8.12.0≤ 8.19.22 affected
9.0.0≤ 9.3.8 affected
9.4.0≤ 9.4.7 affected
9.5.0≤ 9.5.4 affected
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I. Basic Information for CVE-2026-103005

Vulnerability Information
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Vulnerability Title
Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user with connector management privileges could cause the cluster to allocate an uncontrolled amount of memory when connector resources with an excessively large `description` field are created and subsequently accessed, exhausting available heap memory and crashing the affected node.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Elasticsearch 8.12.0 ~ 8.19.22 -

II. Public POCs for CVE-2026-103005

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III. Intelligence Information for CVE-2026-103005

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Other References for CVE-2026-103005 (1)

Same Patch Batch · Elastic · 2026-10-06 · 14 CVEs total

CVE-2026-102406 8.8 HIGH Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Tenant Data In
CVE-2026-103007 7.2 HIGH Incorrect Authorization in Elasticsearch Leading to Privilege Escalation
CVE-2026-103009 7.1 HIGH Authorization Bypass Through User-Controlled Key in Elasticsearch Leading to Information D
CVE-2026-102412 6.5 MEDIUM Incorrect Authorization in Kibana Leading to Sensitive Information Disclosure
CVE-2026-102409 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-102411 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of
CVE-2026-102404 6.5 MEDIUM Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
CVE-2026-103008 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-103006 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-102413 6.2 MEDIUM Uncaught Exception in Elastic Endpoint Leading to Denial of Service
CVE-2026-102407 5.4 MEDIUM Incorrect Authorization in Elasticsearch Leading to Unauthorized Data Stream Modification
CVE-2026-102410 4.3 MEDIUM Missing Authorization in Kibana Leading to Information Disclosure
CVE-2026-102408 4.3 MEDIUM Inefficient Regular Expression Complexity in Elasticsearch Leading to Denial of Service

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-103005

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