---
id: CVE-2026-44253
title: >-
  Wazuh is a free and open source platform used for threat prevention,
  detection, and response
summary: >-
  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 n…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
  - CWE-789
vendor: wazuh
product: wazuh
affected:
  - 'wazuh >= 3.9.0, < 4.14.5'
  - wazuh = 5.0.0
patched:
  - wazuh 4.14.5
published: '2026-08-19'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:47:36.957'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44253'
references:
  - url: >-
      https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c
    label: security-advisories@github.com
  - url: 'https://github.com/wazuh/wazuh/pull/35173'
    label: security-advisories@github.com
  - url: 'https://github.com/wazuh/wazuh/releases/tag/v4.14.5'
    label: security-advisories@github.com
  - url: 'https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2'
    label: security-advisories@github.com
  - url: 'https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00611
epssPercentile: 0.46941
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-25T02:13:22.111115Z'
ingestedAt: '2026-09-10T19:30:24.044Z'
---

## Overview

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.

## Affected

- `wazuh >= 3.9.0, < 4.14.5`
- `wazuh = 5.0.0`

## Remediation

Upgrade past the affected range:

- `wazuh 4.14.5`