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CVE-2026-26936— Inefficient Regular Expression Complexity 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AI推理匿名化引擎存在低效的正则表达式复杂性，可能导致通过正则表达式指数膨胀造成拒绝服务。

CVSS 4.9 · Medium EPSS 0.53% · P42

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-26936

Vulnerability Information
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Vulnerability Title
Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).
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
CWE-1333
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AI推理匿名化引擎存在低效的正则表达式复杂性，可能导致通过正则表达式指数膨胀造成拒绝服务。
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 Kibana 9.0.0 ~ 9.2.4 -

II. Public POCs for CVE-2026-26936

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III. Intelligence Information for CVE-2026-26936

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Vendor Advisories for CVE-2026-26936 (1)

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-2026-26934 6.5 MEDIUM Improper Validation of Specified Quantity in Input 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

IV. Related Vulnerabilities

Same product: Kibana
Same vendor: Elastic
Same weakness: CWE-1333

V. Comments for CVE-2026-26936

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