CVE-2026-44253
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.
Does this matter?
Lower severity and a low EPSS score (0.51%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 4.9 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.51% probability · 42th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770, CWE-789
- Source
- security-advisories@github.com
References
- https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c
- https://github.com/wazuh/wazuh/pull/35173
- https://github.com/wazuh/wazuh/releases/tag/v4.14.5
- https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2
- https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.