Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-44253
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 16:17:10 UTC
Updated2026-08-25 03:16:54 UTC
DescriptionWazuh 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.

Risk And Classification

Primary CVSS: v3.1 4.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-770 | CWE-789 | CWE-789 CWE-789: Memory Allocation with Excessive Size Value | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wazuh Wazuh affected >= 3.9.0, < 4.14.5 Not specified
CNA Wazuh Wazuh affected >= 5.0.0-beta1, < 5.0.0-beta2 Not specified

References

ReferenceSourceLinkTags
github.com/wazuh/wazuh/releases/tag/v4.14.5 [email protected] github.com
github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c [email protected] github.com
github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/wazuh/wazuh/pull/35173 [email protected] github.com
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