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CVE-2026-44253— Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation

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公司开源的一款安全检测与威胁分析平台。 Wazuh 3.9.0版本至4.14.5之前版本和5.0.0-beta1版本至5.0.0-beta2之前版本存在资源管理错误漏洞，该漏洞源于framework/wazuh/core/cluster/common.py中集群协议的receive_str()方法未对InBuffer大小进行限制且divided-message路径对片段数量、聚合大小或过期时间未设限制，可能导致内存耗尽，破坏代理连接和警报处理。

CVSS 4.9 · Medium EPSS 0.42% · P34

Affected Version Matrix 2

VendorProduct Version RangeStatus
wazuh wazuh >= 3.9.0, < 4.14.5 affected
>= 5.0.0-beta1, < 5.0.0-beta2 affected
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I. Basic Information for CVE-2026-44253

Vulnerability Information
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Vulnerability Title
Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation
Source: CVE Program / CVE List V5
Vulnerability Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receive_str() method accepts an attacker-controlled total for InBuffer without a maximum, so a new_str command can request a multi-gigabyte bytearray and repeated requests accumulate in in_str. The divided-message path also retains flag_divided fragments under unique counters in div_msg_box without a count, aggregate-size, or expiration limit. Exploitation can disrupt agent connectivity and alert processing across the monitored environment. This issue is fixed in versions 4.14.5 and 5.0.0-beta2.
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
未经控制的内存分配
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公司开源的一款安全检测与威胁分析平台。 Wazuh 3.9.0版本至4.14.5之前版本和5.0.0-beta1版本至5.0.0-beta2之前版本存在资源管理错误漏洞，该漏洞源于framework/wazuh/core/cluster/common.py中集群协议的receive_str()方法未对InBuffer大小进行限制且divided-message路径对片段数量、聚合大小或过期时间未设限制，可能导致内存耗尽，破坏代理连接和警报处理。
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-2026-44253

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III. Intelligence Information for CVE-2026-44253

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Patches & Fixes for CVE-2026-44253 (2)

Vendor Advisories for CVE-2026-44253 (1)

Vendor Pages for CVE-2026-44253 (1)

Same Patch Batch · wazuh · 2026-08-19 · 13 CVEs total

CVE-2026-48162 9.1 CRITICAL Wazuh: cluster peer can read arbitrary master files and forge offline REST API administrat
CVE-2026-48024 9.1 CRITICAL Wazuh: merged-file header path traversal in cluster sync allows arbitrary file write under
CVE-2026-49441 9.1 CRITICAL Wazuh : peer-controlled metadata key in process_files_from_worker non-merged branch allows
CVE-2026-44901 8.4 HIGH Wazuh Cluster DAPI Protocol Deserialization of Untrusted Data Remote Code Execution Vulner
CVE-2026-41424 8.2 HIGH Wazuh: Privilege Escalation via Admin-Protection Bypass in update-user API Endpoint
CVE-2026-44252 7.7 HIGH Wazuh Manager dapi RBAC Bypass Allows Privilege Escalation
CVE-2026-46343 7.5 HIGH Wazuh: Arbitrary File Deletion via Cluster Protocol – Incomplete Path Validation in end_re
CVE-2026-45798 7.5 HIGH Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd
CVE-2026-44254 5.3 MEDIUM Wazuh: Stack Out-of-Bounds Write in remoted Decompression Path
CVE-2026-44256 5.3 MEDIUM Wazuh: CRLF Log Injection via Unsanitized Basic-Auth Username
CVE-2026-44255 5.3 MEDIUM Wazuh: Username Enumeration via Timing Side-Channel
CVE-2026-49392 5.3 MEDIUM Wazuh: Local SQL injection in FIM db due to path lookup interpolation in wazuh-syscheckd

IV. Related Vulnerabilities

Same product: wazuh
Same vendor: wazuh
Same weakness: CWE-789

V. Comments for CVE-2026-44253

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