Detections
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Wazuh Server 3.9.0 < 4.14.5 DoS (CVE-2026-44253)

medium Nessus Plugin ID 339368

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Synopsis

The remote host contains a threat prevention, detection, and response platform that is affected by a denial of service vulnerability.

Description

The version of Wazuh Server on the remote host is at least 3.9.0 and prior to 4.14.5. It is, therefore, affected by a denial of service vulnerability:

 - The cluster protocol 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, and the divided-message path retains fragments without limits. Exploitation can disrupt agent connectivity and alert processing. (CVE-2026-44253)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Wazuh Server version 4.14.5 or later.

See Also

http://www.nessus.org/u?b4879592

Plugin Details

Severity: Medium

ID: 339368

File Name: wazuh_server_CVE-2026-44253.nasl

Version: 1.3

Type: Local

Agent: unix

Family: Misc.

Published: 8/25/2026

Updated: 9/23/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.61

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.8

Vector: CVSS2#AV:N/AC:L/Au:M/C:N/I:N/A:C

CVSS Score Source: CVE-2026-44253

CVSS v3

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.4

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:wazuh:wazuh

Required KB Items: installed_sw/Wazuh-Manager

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/7/2026

Vulnerability Publication Date: 8/7/2026

Reference Information

CVE: CVE-2026-44253

CWE: 770, 789