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CVE-2026-25771— Wazuh Vulnerable to Denial of Service via Synchronous I/O Blocking in Asynchronous Authentication Middleware

Quick assessment

Affected
wazuh wazuh
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.

Wazuh是Wazuh开源的一个应用软件。用于收集，汇总，索引和分析安全数据，帮助组织检测入侵，威胁和行为异常。 Wazuh 4.3.0至4.14.3之前版本存在资源管理错误漏洞，该漏洞源于API身份验证中间件存在拒绝服务问题，可能导致未经身份验证的远程攻击者通过洪泛请求使应用程序耗尽CPU资源。

CVSS 5.3 · Medium EPSS 0.72% · P53
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I. Basic Information for CVE-2026-25771

Vulnerability Information
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Vulnerability Title
Wazuh Vulnerable to Denial of Service via Synchronous I/O Blocking in Asynchronous Authentication Middleware
Source: CVE Program / CVE List V5
Vulnerability Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. Starting in version 4.3.0 and prior to version 4.14.3, a Denial of Service (DoS) vulnerability exists in the Wazuh API authentication middleware (`middlewares.py`). The application uses an asynchronous event loop (Starlette/Asyncio) to call a synchronous function (`generate_keypair`) that performs blocking disk I/O on every request containing a Bearer token. An unauthenticated remote attacker can exploit this by flooding the API with requests containing invalid Bearer tokens. This forces the single-threaded event loop to pause for file read operations repeatedly, starving the application of CPU resources and potentially preventing it from accepting or processing legitimate connections. Version 4.14.3 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Wazuh 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wazuh是Wazuh开源的一个应用软件。用于收集，汇总，索引和分析安全数据，帮助组织检测入侵，威胁和行为异常。 Wazuh 4.3.0至4.14.3之前版本存在资源管理错误漏洞，该漏洞源于API身份验证中间件存在拒绝服务问题，可能导致未经身份验证的远程攻击者通过洪泛请求使应用程序耗尽CPU资源。
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
wazuh wazuh >= 4.3.0, < 4.14.3 -

II. Public POCs for CVE-2026-25771

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III. Intelligence Information for CVE-2026-25771

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Vendor Advisories for CVE-2026-25771 (1)

Same Patch Batch · wazuh · 2026-03-17 · 5 CVEs total

CVE-2026-25769 9.1 CRITICAL Wazuh Cluster vulnerable to Remote Code Execution via Insecure Deserialization
CVE-2026-25770 9.1 CRITICAL Wazuh has Privilege Escalation to Root via Cluster Protocol File Write
CVE-2026-25772 4.9 MEDIUM Wazuh Database Synchronization Vulnerable to Stack-based Buffer Overflow via snprintf Inte
CVE-2026-25790 4.9 MEDIUM Wazuh has Stack-Based Buffer Overflow in Security Configuration Assessment JSON Parser

IV. Related Vulnerabilities

Same product: wazuh
Same vendor: wazuh
Same weakness: CWE-400

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