Buffer overflow in Wazuh
CVE-2026-25772
Wazuh is a free and open source platform used for threat prevention, detection, and response. Starting in version 4.4.0 and prior to version 4.14.3, a stack-based buffer overflow vulnerability exists in the Wazuh Database synchronization module (`wdb_delta_event.c`). The SQL query construction logic allows for an integer underflow when calculating the remaining buffer size. This occurs because the code incorrectly aggregates the return value of `snprintf`. If a specific database synchronization payload exceeds the size of the query buffer (2048 bytes), the size calculation wraps around to a massive integer, effectively removing bounds checking for subsequent writes. This allows an attacker to corrupt the stack, leading to a Denial of Service (DoS) or potentially RCE. Version 4.14.3 fixes the issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Wazuh — versions >= 4.4.0, < 4.14.3
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-h7vp-j34v-h6j5 (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-25772?
- CVE-2026-25772 is a medium-severity vulnerability in Wazuh, classified under Stack-based Buffer Overflow. CVSS score: 4.9/10. Published 2026-03-17.
- How severe is CVE-2026-25772?
- Medium severity. CVSS v3 base score is 4.9 out of 10.