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CVE-2026-63140— Reachable Assertion 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 8.0.0至8.19.18版本、9.0.0至9.3.7版本和9.4.0至9.4.3版本存在异常处理不当漏洞，该漏洞源于可达断言（CWE-617），可能导致低权限认证用户通过包含空值的特制搜索请求引发查询解析内部断言失败，导致受影响节点进程终止，造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
Elastic Elasticsearch 9.0.0≤ 9.3.7 affected
9.4.0≤ 9.4.3 affected
8.0.0≤ 8.19.18 affected
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I. Basic Information for CVE-2026-63140

Vulnerability Information
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Vulnerability Title
Reachable Assertion in Elasticsearch Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Reachable Assertion (CWE-617) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). A specially crafted search request containing a null value in a specific query clause causes an internal assertion to be raised during query parsing. Because Elasticsearch treats assertion failures as fatal errors, this terminates the affected node process. A low-privileged authenticated user with read access to at least one index can exploit this condition with a single request to cause a node to terminate, disrupting search availability. In a single-node deployment this fully stops Elasticsearch; in a multi-node cluster it reduces cluster capacity for each 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
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Elasticsearch 异常处理不当漏洞
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 8.0.0至8.19.18版本、9.0.0至9.3.7版本和9.4.0至9.4.3版本存在异常处理不当漏洞，该漏洞源于可达断言（CWE-617），可能导致低权限认证用户通过包含空值的特制搜索请求引发查询解析内部断言失败，导致受影响节点进程终止，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 9.0.0 ~ 9.3.7 -

II. Public POCs for CVE-2026-63140

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III. Intelligence Information for CVE-2026-63140

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Vendor Advisories for CVE-2026-63140 (1)

Same Patch Batch · Elastic · 2026-07-21 · 19 CVEs total

CVE-2026-56147 7.1 HIGH Authorization Bypass Through User-Controlled Key in Kibana Leading to Unauthorized Informa
CVE-2026-42397 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-63263 6.5 MEDIUM Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
CVE-2026-63260 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-63261 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-63144 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-63136 6.5 MEDIUM Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
CVE-2026-63139 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-56145 6.5 MEDIUM Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
CVE-2026-63141 6.3 MEDIUM Missing Authorization in Kibana Leading to Unauthorized Access to Cloud Connect Management
CVE-2026-56146 5.4 MEDIUM Improper Access Control in Kibana Leading to Unauthorized Data Modification and Informatio
CVE-2026-56144 5.3 MEDIUM Incorrect Authorization in Elasticsearch Leading to Information Disclosure
CVE-2026-63142 5.0 MEDIUM Incomplete List of Disallowed Inputs in Kibana Leading to Server-Side Request Forgery
CVE-2026-63143 4.3 MEDIUM Missing Authorization in Kibana Leading to Unauthorized Information Disclosure
CVE-2026-63259 4.3 MEDIUM Authorization Bypass Through User-Controlled Key in Kibana Leading to Information Disclosu
CVE-2026-63145 4.3 MEDIUM Incorrect Authorization in Kibana Leading to Machine Learning Audit Log Integrity Compromi
CVE-2026-63262 4.3 MEDIUM Missing Authorization in Kibana Leading to Information Disclosure
CVE-2026-49092 4.3 MEDIUM Unintended Proxy or Intermediary ('Confused Deputy') in Kibana Leading to Unauthorized Inf

IV. Related Vulnerabilities

Same product: Elasticsearch
Same vendor: Elastic
Same weakness: CWE-617

V. Comments for CVE-2026-63140

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