What is CVE-2026-28221?

CVE-2026-28221 is a medium-severity vulnerability in Wazuh, classified under Stack-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-04-29.

How severe is CVE-2026-28221?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Wazuh

CVE-2026-28221

Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 4.8.0 to before version 4.14.4, a stack-based buffer overflow exists in print_hex_string() in wazuh-remoted. The bug is triggered wh…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (26.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Wazuh — versions >= 4.8.0, < 4.14.4

Weakness classification (CWE)

References

https://github.com/wazuh/wazuh/security/advisories/GHSA-q9vv-7w4c-f4cm (x_refsource_CONFIRM, Exploit, Vendor Advisory)
https://github.com/wazuh/wazuh/releases/tag/v4.14.4 (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-28221?: CVE-2026-28221 is a medium-severity vulnerability in Wazuh, classified under Stack-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-04-29.
How severe is CVE-2026-28221?: Medium severity. CVSS v3 base score is 6.5 out of 10.