CVE-2026-25771 Details
Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. Starting in version 4.3.0 and prior to version 4.14.3, a Denial of Service (DoS) vulnerability exists in the Wazuh API authentication middleware (`middlewares.py`). The application uses an asynchronous event loop (Starlette/Asyncio) to call a synchronous function (`generate_keypair`) that performs blocking disk I/O on every request containing a Bearer token. An unauthenticated remote attacker can exploit this by flooding the API with requests containing invalid Bearer tokens. This forces the single-threaded event loop to pause for file read operations repeatedly, starving the application of CPU resources and potentially preventing it from accepting or processing legitimate connections. Version 4.14.3 fixes the issue.
A denial-of-service vulnerability has been identified in the Wazuh API authentication middleware, affecting versions 4.3.0 prior to 4.14.3. The issue arises because the application, which uses an asynchronous event loop, calls a synchronous function that performs blocking disk I/O on every request with a Bearer token. This vulnerability can be exploited by an unauthenticated remote attacker who floods the API with requests containing invalid Bearer tokens. The blocking I/O operations cause the single-threaded event loop to pause repeatedly for file read operations, consuming CPU resources and potentially disrupting the processing of legitimate connections.
Users can upgrade to Wazuh version 4.14.3 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/wazuh/wazuh/security/advisories/GHSA-33w3-p5hm-jw7g | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wazuh wazuh | >= 4.3.0, < 4.14.3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 19, 2026 | Initial Analysis | [email protected] |
| Mar 17, 2026 | New CVE Received | [email protected] |