CVE-2026-25772 Wazuh Database Synchronization Vulnerable to Stack-based Buffer Overflow via snprintf Integer Underflow
An integer underflow in Wazuh's database synchronization allows stack corruption, leading to denial of service or remote code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-25772?
CVE-2026-25772 is a medium-severity vulnerability in Wazuh Wazuh, published on 17 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-25772?
It affects 1 product.
Products include Wazuh Wazuh.
How do I fix CVE-2026-25772?
No fix has been published for CVE-2026-25772 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-25772 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25772 exists.
Other vulnerabilities in Wazuh Wazuh
- CVE-2025-24016 Wazuh Server Deserialization of Untrusted Data
- CVE-2024-32038 Wazuh Analysis Engine Event Decoder Heap-based Buffer Overflow Remote Code Execution Vulnerability
- CVE-2021-44079 Command injection in n/a
- CVE-2024-1243 Remote code execution and local privilege escalation in Wazuh Windows agent via NetNTLMv2 hash theft
- CVE-2026-61800 Wazuh cluster worker file sync allows arbitrary file write under /var/ossec (incomplete fix for CVE-2026-30893)
Sources
Also known as GHSA-h7vp-j34v-h6j5.