A critical buffer overflow vulnerability (CWE-787) has been identified in libwebsockets, a lightweight C library for network protocols. This flaw allows writing data outside the intended buffer boundaries, impacting confidentiality, integrity, and availability. The vulnerability affects versions prior to 4.3.0-13.oe2203sp4. A fix is available in version 4.3.0-13.oe2203sp4. The CVSS v3.1 base score is 8.1, indicating high severity.