CVE-2026-44251: wazuh Heap Overflow — Exploit & Fix

Description

Wazuh is a free and open source platform used for threat prevention, detection, and response. In versions 3.0.0 and above, prior to 4.14.5, a size_t integer underflow in os_crypto/shared/msgs.c:389 allows any enrolled Wazuh agent to crash the wazuh-remoted process on the manager, immediately disconnecting all agents from the manager. A second code path reached by the same underflow may allow heap memory corruption. This issue has been fixed in version 4.14.5.

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CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0031

Probability of exploitation

0.23%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-122 CWE-122

CWE-191 CWE-191

Affected Products

Vendor	Product	Versions
wazuh	wazuh	3.0.0 — 4.14.5

References

Advisories & Patches

https://github.com/wazuh/wazuh/security/advisories/GHSA-jv5r-5p7c-g9fq https://github.com/wazuh/wazuh/security/advisories/GHSA-jv5r-5p7c-g9fq

Exploits

https://github.com/wazuh/wazuh/security/advisories/GHSA-jv5r-5p7c-g9fq https://github.com/wazuh/wazuh/security/advisories/GHSA-jv5r-5p7c-g9fq

Frequently Asked Questions

What is CVE-2026-44251? +

Wazuh is a free and open source platform used for threat prevention, detection, and response. In versions 3.0.0 and above, prior to 4.14.5, a size_t integer underflow in os_crypto/shared/msgs.c:389 allows any enrolled Wazuh agent to crash the wazuh-remoted process on the manager, immediately disconnecting all agents from the manager. A second code path reached by the same underflow may allow heap memory corruption. This issue has been fixed in version 4.14.5. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-44251? +

CVE-2026-44251 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0031, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44251? +

CVE-2026-44251 affects products from wazuh, specifically: wazuh. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44251? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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