Medium severity · published Aug 19, 2026
CVE-2026-44256
Wazuh: CRLF Log Injection via Unsanitized Basic-Auth Username
5.3
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
wazuh · wazuh
>= 4.4.0, < 4.14.6; >= 5.0.0-beta1, < 5.0.0-beta2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44256
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44256
Patch
https://github.com/wazuh/wazuh/commit/cddf3fd16b0f945b28eb9c27714de3cc344e0926
Issue Tracking
https://github.com/wazuh/wazuh/pull/35866
Release Notes
https://github.com/wazuh/wazuh/releases/tag/v4.14.6
Release Notes
https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2
Exploit
https://github.com/wazuh/wazuh/security/advisories/GHSA-c3m6-fp2h-wmr4
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