CVE-2026-44253
Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation
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.
INFO
Published Date :
Aug. 19, 2026, 4:17 p.m.
Last Modified :
Sept. 22, 2026, 7:47 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Wazuh to version 4.14.5 or later.
- Update Wazuh to version 5.0.0-beta2 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-44253.
| URL | Resource |
|---|---|
| https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c | Patch |
| https://github.com/wazuh/wazuh/pull/35173 | Issue Tracking Patch |
| https://github.com/wazuh/wazuh/releases/tag/v4.14.5 | Patch Release Notes |
| https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 | Exploit Vendor Advisory |
| https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44253 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-44253
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44253 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44253 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 22, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:wazuh:wazuh:5.0.0:beta1:*:*:*:*:*:* *cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:* versions from (including) 3.9.0 up to (excluding) 4.14.5 Added Reference Type GitHub, Inc.: https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/wazuh/wazuh/pull/35173 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/wazuh/wazuh/releases/tag/v4.14.5 Types: Patch, Release Notes Added Reference Type GitHub, Inc.: https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 25, 2026
Action Type Old Value New Value Added Reference https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 Added SSVC {'id': 'CVE-2026-44253', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-25T02:13:22.111115Z'} -
New CVE Received by [email protected]
Aug. 19, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'wazuh', 'product': 'wazuh', 'versions': [{'status': 'affected', 'version': '>= 3.9.0, < 4.14.5'}, {'status': 'affected', 'version': '>= 5.0.0-beta1, < 5.0.0-beta2'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added CWE CWE-789 Added Reference https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c Added Reference https://github.com/wazuh/wazuh/pull/35173 Added Reference https://github.com/wazuh/wazuh/releases/tag/v4.14.5 Added Reference https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2