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.
Affected products
wazuh: wazuh
References5
- github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 ExploitVendor Advisory
- github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 ExploitVendor Advisory
- github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e0622902… Patch
- github.com/wazuh/wazuh/pull/35173 Issue TrackingPatch
- github.com/wazuh/wazuh/releases/tag/v4.14.5 PatchRelease Notes
Metrics
- CVSS 3.1
-
4.9
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 50 · as of 10 November 2026
- CWE
- CWE-770CWE-789
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