CVE-2026-26933— Improper Validation of Array Index in Packetbeat Leading to Denial of Service
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I. Basic Information for CVE-2026-26933
Vulnerability Information
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Vulnerability Title
Improper Validation of Array Index in Packetbeat Leading to Denial of Service
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper Validation of Array Index (CWE-129) in multiple protocol parser components in Packetbeat can lead Denial of Service via Input Data Manipulation (CAPEC-153). An attacker with the ability to send specially crafted, malformed network packets to a monitored network interface can trigger out-of-bounds read operations, resulting in application crashes or resource exhaustion. This requires the attacker to be positioned on the same network segment as the Packetbeat deployment or to control traffic routed to monitored interfaces.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对数组索引的验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Elastic Packetbeat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Packetbeat是荷兰Elastic公司的一个数据采集器。 Elastic Packetbeat存在安全漏洞，该漏洞源于多个协议解析器组件存在数组索引验证不当问题，可能导致通过输入数据操纵触发越界读取，造成应用程序崩溃或资源耗尽。
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 | Packetbeat | 9.0.0 ~ 9.2.4 | - |
II. Public POCs for CVE-2026-26933
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Elastic · 2026-03-19 · 4 CVEs total
| CVE-2026-26939 | 6.5 MEDIUM | Missing Authorization in Kibana Leading to Unauthorized Endpoint Response Action Configura |
| CVE-2026-26940 | 6.5 MEDIUM | Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service |
| CVE-2026-26931 | 5.7 MEDIUM | Memory Allocation with Excessive Size Value in Metricbeat Leading to Denial of Service |
IV. Related Vulnerabilities
Same vendor: Elastic
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Improper Verification of Cryptographic Signature in Elastic - CVE-2026-33466
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Server-Side Request Forgery (SSRF) in Kibana One Workflow Le - CVE-2026-33459
Uncontrolled Resource Consumption in Kibana Leading to Denia - CVE-2026-33460
Incorrect Authorization in Kibana Fleet Leading to Informati
Same weakness: CWE-129
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ONE 输入验证错误漏洞 - CVE-2026-40097
Step CA affected by an index out of bounds panic in TPM atte
V. Comments for CVE-2026-26933
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