CVE-2026-44256 Wazuh: CRLF Log Injection via Unsanitized Basic-Auth Username
Unauthenticated attackers can inject CRLF characters into API logs via Basic Auth usernames, potentially forging log entries or obscuring activity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44256?
CVE-2026-44256 is a medium-severity vulnerability in Wazuh Wazuh, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-117
Which versions are affected by CVE-2026-44256?
It affects 1 product.
Products include Wazuh Wazuh.
How do I fix CVE-2026-44256?
No fix has been published for CVE-2026-44256 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-44256 being exploited?
There is no known exploitation of CVE-2026-44256 in the wild and no public exploit code.
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-c3m6-fp2h-wmr4.