static VncClientInfo *qmp_query_vnc_client(const VncState *client)
{
    struct sockaddr_storage sa;
    socklen_t salen = sizeof(sa);
    char host[NI_MAXHOST];
    char serv[NI_MAXSERV];
    VncClientInfo *info;

    if (getpeername(client->csock, (struct sockaddr *)&sa, &salen) < 0) {
        return NULL;
    }

    if (getnameinfo((struct sockaddr *)&sa, salen,
                    host, sizeof(host),
                    serv, sizeof(serv),
                    NI_NUMERICHOST | NI_NUMERICSERV) < 0) {
        return NULL;
    }

    info = g_malloc0(sizeof(*info));
    info->base = g_malloc0(sizeof(*info->base));
    info->base->host = g_strdup(host);
    info->base->service = g_strdup(serv);
    info->base->family = inet_netfamily(sa.ss_family);

#ifdef CONFIG_VNC_TLS
    if (client->tls.session && client->tls.dname) {
        info->has_x509_dname = true;
        info->x509_dname = g_strdup(client->tls.dname);
    }
#endif
#ifdef CONFIG_VNC_SASL
    if (client->sasl.conn && client->sasl.username) {
        info->has_sasl_username = true;
        info->sasl_username = g_strdup(client->sasl.username);
    }
#endif

    return info;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.