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CVE-2026-33754— Wazuh: Unauthenticated cluster packet length leads to uncontrolled memory allocation (remote 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 3.9.0及之后、4.14.5之前版本存在资源管理错误漏洞，该漏洞源于集群协议解析器信任未经验证/解密的消息头中的任意大有效载荷长度，并直接用于内存分配，可能导致远程攻击者触发内存消耗，造成未经身份验证的拒绝服务。

CVSS 6.5 · Medium EPSS 0.37% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
wazuh wazuh >= 3.9.0, < 4.14.5 affected
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I. Basic Information for CVE-2026-33754

Vulnerability Information
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Vulnerability Title
Wazuh: Unauthenticated cluster packet length leads to uncontrolled memory allocation (remote DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. In versions 3.9.0 and above, prior to 4.14.5, a remote attacker can trigger memory exhaustion in the cluster protocol parser by sending a crafted message header with an arbitrarily large payload length. The length is trusted before authentication/decryption and used directly to allocate memory, allowing unauthenticated denial of service of the cluster service. This issue has been fixed in version 4.14.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 3.9.0及之后、4.14.5之前版本存在资源管理错误漏洞，该漏洞源于集群协议解析器信任未经验证/解密的消息头中的任意大有效载荷长度，并直接用于内存分配，可能导致远程攻击者触发内存消耗，造成未经身份验证的拒绝服务。
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
wazuh wazuh >= 3.9.0, < 4.14.5 -

II. Public POCs for CVE-2026-33754

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III. Intelligence Information for CVE-2026-33754

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Vendor Advisories for CVE-2026-33754 (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-2026-40106 4.7 MEDIUM Wazuh: Heap-based Buffer Overflow in syscheck Registry Wildcard Expansion (LPE / DoS)
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-400

V. Comments for CVE-2026-33754

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