Vulnerability in Wazuh
CVE-2026-44256
Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.4.0 until 4.14.6 and 5.0.0-beta2, api/api/middlewares.py decodes the Basic authentication username before credential validation and passes it to the access logger without neutralizing control characters. api/api/alogging.py interpolates that value into the plain-text API log. An unauthenticated attacker can include carriage returns or line feeds in the username to forge entries, obscure activity, or poison systems that consume the plain-text audit log. The JSON log format is not affected because JSON serialization escapes these characters. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.5% 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, < 4.14.6, 5.0.0, >= 5.0.0-beta1, < 5.0.0-beta2
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-c3m6-fp2h-wmr4 (Exploit, Vendor Advisory)
- github.com/wazuh/wazuh/pull/35866 (Patch, Issue Tracking)
- github.com/wazuh/wazuh/commit/cddf3fd16b0f945b28eb9c27714de3cc344e0926 (Patch)
- github.com/wazuh/wazuh/releases/tag/v4.14.6 (Release Notes)
- github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 (Release Notes)
Frequently asked questions
- What is CVE-2026-44256?
- CVE-2026-44256 is a medium-severity vulnerability in Wazuh, classified under Improper Output Neutralization for Logs. CVSS score: 5.3/10. Published 2026-08-19.
- How severe is CVE-2026-44256?
- Medium severity. CVSS v3 base score is 5.3 out of 10.