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CVE-2026-40106— Wazuh: Heap-based Buffer Overflow in syscheck Registry Wildcard Expansion (LPE / DoS)

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是美国Wazuh公司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 4.6.0版本至4.14.5之前版本存在缓冲区错误漏洞，该漏洞源于syscheck组件存在堆缓冲区溢出漏洞，当扩展包含通配符(*或?)的注册表路径时，分配固定大小为256字节的堆缓冲区，攻击者通过创建最大长度255字符的注册表子键，在字符串连接过程中造成越界写入，可能导致拒绝服务(使代理失明)或本地权限提升。

CVSS 4.7 · Medium EPSS 0.13% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
wazuh wazuh >= 4.6.0, < 4.14.5 affected
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I. Basic Information for CVE-2026-40106

Vulnerability Information
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Vulnerability Title
Wazuh: Heap-based Buffer Overflow in syscheck Registry Wildcard Expansion (LPE / DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. Versions 4.6.0 and above prior to 4.14.5 contain a heap-based buffer overflow vulnerability in the syscheck component of the Wazuh agent for Windows. When expanding registry paths containing wildcards (* or ?), the agent allocates a fixed-size heap buffer of 256 bytes (OS_SIZE_256). By creating a registry subkey with a maximum allowed length (255 characters) inside a monitored path, a low-privileged local attacker can force an out-of-bounds write during string concatenation. Since wazuh-agent.exe runs as NT AUTHORITY\SYSTEM, this can lead to a silent Denial of Service (blinding the agent) or potentially Local Privilege Escalation (LPE). This issue has been fixed in version 4.14.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Wazuh 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wazuh是美国Wazuh公司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 4.6.0版本至4.14.5之前版本存在缓冲区错误漏洞，该漏洞源于syscheck组件存在堆缓冲区溢出漏洞，当扩展包含通配符(*或?)的注册表路径时，分配固定大小为256字节的堆缓冲区，攻击者通过创建最大长度255字符的注册表子键，在字符串连接过程中造成越界写入，可能导致拒绝服务(使代理失明)或本地权限提升。
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 >= 4.6.0, < 4.14.5 -

II. Public POCs for CVE-2026-40106

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III. Intelligence Information for CVE-2026-40106

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Vendor Advisories for CVE-2026-40106 (1)

Same Patch Batch · wazuh · 2026-07-16 · 5 CVEs total

CVE-2026-39359 7.5 HIGH Wazuh: Unauthenticated Path Traversal in authd via Agent Group Name
CVE-2026-34150 7.5 HIGH Wazuh: Heap buffer overflow in wazuh-analysisd via rootcheck event parsing
CVE-2026-33754 6.5 MEDIUM Wazuh: Unauthenticated cluster packet length leads to uncontrolled memory allocation (remo
CVE-2026-33434 4.3 MEDIUM Wazuh: Rate Limit Bypass via /events Endpoint

IV. Related Vulnerabilities

Same product: wazuh
Same vendor: wazuh
Same weakness: CWE-122

V. Comments for CVE-2026-40106

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