Wazuh up to 4.14.3 remoted_op.c parse_uname_string buffer underflow

Summaryinfo

A vulnerability classified as problematic was found in Wazuh up to 4.14.3. This affects the function parse_uname_string of the file remoted_op.c. The manipulation results in buffer underflow. This vulnerability is reported as CVE-2026-41499. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Wazuh up to 4.14.3. Affected is the function parse_uname_string of the file remoted_op.c. The manipulation with an unknown input leads to a buffer underflow vulnerability. CWE is classifying the issue as CWE-124. The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer. This is going to have an impact on availability. CVE summarizes:

Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 4.0.0 to before version 4.14.4, multiple heap-based out-of-bounds WRITE vulnerabilities exist in parse_uname_string() (remoted_op.c). This function processes OS identification data from agents and contains a dangerous code pattern that appears in 4 locations within the same function: writing to strlen(ptr) - 1 without checking for empty strings. When the string is empty, strlen() returns 0, and 0 - 1 wraps to SIZE_MAX due to unsigned integer underflow. Due to pointer arithmetic wrapping, SIZE_MAX effectively becomes -1, causing a write exactly 1 byte before the allocated buffer. This corrupts heap metadata (e.g., the chunk size field in glibc malloc), leading to heap corruption. This issue has been patched in version 4.14.4.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-41499 since 04/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available.

Upgrading to version 4.14.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-26272) and CERT Bund (WID-SEC-2026-1295). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Open Source Wazuh

Productinfo

Name

• Wazuh

Version

• 4.14.0
• 4.14.1
• 4.14.2
• 4.14.3

Website

• Product: https://github.com/wazuh/wazuh/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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