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CVE-2026-26934— Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service

Quick assessment

Affected
Elastic Kibana
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 Kibana是Elastic公司的一个可用数据可视化仪表板软件。 Elastic Kibana存在安全漏洞，该漏洞源于输入数量验证不当，可能导致具有只读权限的经过身份验证的攻击者通过发送特制的畸形有效载荷造成资源过度消耗，导致Kibana无响应或崩溃。

CVSS 6.5 · Medium EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-26934

Vulnerability Information
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Vulnerability Title
Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Validation of Specified Quantity in Input (CWE-1284) in Kibana can allow an authenticated attacker with view-only privileges to cause a Denial of Service via Input Data Manipulation (CAPEC-153). An attacker can send a specially crafted, malformed payload causing excessive resource consumption and resulting in Kibana becoming unresponsive or crashing.
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
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Kibana 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Kibana是Elastic公司的一个可用数据可视化仪表板软件。 Elastic Kibana存在安全漏洞，该漏洞源于输入数量验证不当，可能导致具有只读权限的经过身份验证的攻击者通过发送特制的畸形有效载荷造成资源过度消耗，导致Kibana无响应或崩溃。
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 Kibana 8.18.0 ~ 8.19.11 -

II. Public POCs for CVE-2026-26934

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III. Intelligence Information for CVE-2026-26934

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Same Patch Batch · Elastic · 2026-02-26 · 6 CVEs total

CVE-2026-26938 8.6 HIGH Improper Neutralization of Special Elements Used in a Template Engine in Kibana Workflows
CVE-2026-26937 6.5 MEDIUM Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
CVE-2026-26935 6.5 MEDIUM Improper Input Validation in Kibana Leading to Denial of Service
CVE-2026-26932 5.7 MEDIUM Improper Validation of Array Index in Packetbeat Leading to Denial of Service
CVE-2026-26936 4.9 MEDIUM Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service

IV. Related Vulnerabilities

Same product: Kibana
Same vendor: Elastic
Same weakness: CWE-1284

V. Comments for CVE-2026-26934

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