diff --git a/INSTALL.md b/INSTALL.md
index 4d8f7f91..71d7bff5 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -18,6 +18,7 @@ General build environment:
 
 Specific development libraries:
 * libcjson >= 1.7.14 (util)
+* libcurl >= 7.74.0 (openvasd)
 * libglib >= 2.42 (all)
 * libgio >= 2.42 (util)
 * zlib >= 1.2.8 (util)
@@ -45,6 +46,7 @@ Install prerequisites on Debian GNU/Linux 'Bullseye' 11:
     cmake \
     pkg-config \
     libcjson-dev \
+    libcurl4-openssl-dev \
     libglib2.0-dev \
     libgpgme-dev \
     libgnutls28-dev \
diff --git a/openvasd/openvasd.c b/openvasd/openvasd.c
index 69315fc0..271c467f 100644
--- a/openvasd/openvasd.c
+++ b/openvasd/openvasd.c
@@ -234,26 +234,26 @@ init_openvasd_stringstream (openvasd_stringstream *s)
   s->ptr = g_malloc0 (s->len + 1);
 }
 
-/** @brief Reinitialize the string struct to hold the response
+/** @brief Free the string struct to hold the response
  *
- *  @param s The string struct to be initialized
+ *  @param s The string struct to be freed
  */
-static void
-reset_openvasd_stringstream (openvasd_stringstream *s)
+void
+free_openvasd_stringstream (openvasd_stringstream *s)
 {
-  g_free (s->ptr);
-  init_openvasd_stringstream (s);
+  if (s)
+    g_free (s->ptr);
 }
 
-/** @brief Free the string struct to hold the response
+/** @brief Reinitialize the string struct to hold the response
  *
- *  @param s The string struct to be initialized
+ *  @param s The string struct to be reset
  */
-static void
-free_openvasd_stringstream (openvasd_stringstream *s)
+void
+reset_openvasd_stringstream (openvasd_stringstream *s)
 {
-  if (s)
-    g_free (s->ptr);
+  free_openvasd_stringstream (s);
+  init_openvasd_stringstream (s);
 }
 
 /** @brief Call back function to stored the response.
@@ -529,7 +529,7 @@ openvasd_get_version (openvasd_connector_t *conn)
       curl_slist_free_all (customheader);
       response->code = RESP_CODE_ERR;
       response->body = err;
-      free_openvasd_stringstream (resp.ptr);
+      free_openvasd_stringstream (&resp);
       return response;
     }
 
@@ -538,7 +538,7 @@ openvasd_get_version (openvasd_connector_t *conn)
   if (response->code != RESP_CODE_ERR)
     response->body = g_strdup (resp.ptr);
 
-  free_openvasd_stringstream (resp.ptr);
+  free_openvasd_stringstream (&resp);
   return response;
 }
 
diff --git a/openvasd/openvasd.h b/openvasd/openvasd.h
index adda1ab7..31c34f05 100644
--- a/openvasd/openvasd.h
+++ b/openvasd/openvasd.h
@@ -287,6 +287,12 @@ typedef struct openvasd_string
 void
 init_openvasd_stringstream (openvasd_stringstream *s);
 
+void
+reset_openvasd_stringstream (openvasd_stringstream *s);
+
+void
+free_openvasd_stringstream (openvasd_stringstream *s);
+
 openvasd_curlm_t *
 openvasd_curlm_handler_new (void);
 
diff --git a/openvasd/vtparser.c b/openvasd/vtparser.c
index 52b46779..2007598e 100644
--- a/openvasd/vtparser.c
+++ b/openvasd/vtparser.c
@@ -226,7 +226,7 @@ parse_references (nvti_t *nvt, cJSON *vt_obj)
           }
         else
           {
-            g_warning ("%s: REF missing type attribute", __func__);
+            g_warning ("%s: REF missing class attribute", __func__);
             continue;
           }
       }
@@ -346,6 +346,7 @@ openvasd_parse_vt (gvm_json_pull_parser_t *parser, gvm_json_pull_event_t *event)
       cJSON_Delete (vt_obj);
       return NULL;
     }
+  g_free (error_message);
 
   nvt = nvti_new ();
 
@@ -356,7 +357,6 @@ openvasd_parse_vt (gvm_json_pull_parser_t *parser, gvm_json_pull_event_t *event)
     {
       g_warning ("%s: VT missing OID", __func__);
       cJSON_Delete (vt_obj);
-      g_free (error_message);
       nvti_free (nvt);
       return NULL;
     }
@@ -368,7 +368,6 @@ openvasd_parse_vt (gvm_json_pull_parser_t *parser, gvm_json_pull_event_t *event)
     {
       g_warning ("%s: VT missing NAME", __func__);
       cJSON_Delete (vt_obj);
-      g_free (error_message);
       nvti_free (nvt);
       return NULL;
     }
@@ -380,7 +379,6 @@ openvasd_parse_vt (gvm_json_pull_parser_t *parser, gvm_json_pull_event_t *event)
     {
       g_warning ("%s: VT missing FAMILY", __func__);
       cJSON_Delete (vt_obj);
-      g_free (error_message);
       nvti_free (nvt);
       return NULL;
     }
@@ -392,7 +390,6 @@ openvasd_parse_vt (gvm_json_pull_parser_t *parser, gvm_json_pull_event_t *event)
     {
       g_warning ("%s: VT missing CATEGORY", __func__);
       cJSON_Delete (vt_obj);
-      g_free (error_message);
       nvti_free (nvt);
       return NULL;
     }
@@ -404,6 +401,5 @@ openvasd_parse_vt (gvm_json_pull_parser_t *parser, gvm_json_pull_event_t *event)
   parse_references (nvt, vt_obj);
   add_preferences_to_nvt (nvt, vt_obj);
   cJSON_Delete (vt_obj);
-  g_free (error_message);
   return nvt;
 }