CVE-2026-63388

A flaw was found in Libevent. A heap out-of-bounds write vulnerability in the bufferevent_socket_set_conn_address_ function allows an unauthenticated local peer to achieve arbitrary code execution. By connecting to an AF_UNIX listener, an attacker can overwrite critical heap data, leading to memory corruption and potentially full control over the affected system. This can severely impact the confidentiality, integrity, and availability of data and services.

This is an Important vulnerability in libevent that allows an unauthenticated local attacker to achieve arbitrary code execution. By connecting to an AF_UNIX listener, an attacker can trigger a heap out-of-bounds write, leading to memory corruption and high impact on system confidentiality, integrity, and availability. The local attack vector limits the immediate threat, but the unauthenticated nature and severe consequences elevate its importance.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.