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CVE-2026-44253

4.9 medium SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 5

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 4.9 · wazuhNVD modified 2026-10-27 11:10

Affected (CPE criteria) 2

  • cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*
  • cpe:2.3:a:wazuh:wazuh:5.0.0:beta1:*:*:*:*:*:*

References 5