diff --color -ru ../libssh-0.9.6/src/buffer.c ./src/buffer.c
--- ../libssh-0.9.6/src/buffer.c	2023-05-03 11:53:48.710217753 +0200
+++ ./src/buffer.c	2023-05-03 11:58:21.995200990 +0200
@@ -747,7 +747,8 @@
  */
 int ssh_buffer_validate_length(struct ssh_buffer_struct *buffer, size_t len)
 {
-    if (buffer->pos + len < len || buffer->pos + len > buffer->used) {
+    if (buffer == NULL || buffer->pos + len < len ||
+        buffer->pos + len > buffer->used) {
         return SSH_ERROR;
     }
 
diff --color -ru ../libssh-0.9.6/src/gssapi.c ./src/gssapi.c
--- ../libssh-0.9.6/src/gssapi.c	2023-05-03 11:53:48.732217993 +0200
+++ ./src/gssapi.c	2023-05-03 11:58:21.976200782 +0200
@@ -437,11 +437,18 @@
         hexa = ssh_get_hexa(output_token.value, output_token.length);
         SSH_LOG(SSH_LOG_PACKET, "GSSAPI: sending token %s",hexa);
         SAFE_FREE(hexa);
-        ssh_buffer_pack(session->out_buffer,
-                        "bdP",
-                        SSH2_MSG_USERAUTH_GSSAPI_TOKEN,
-                        output_token.length,
-                        (size_t)output_token.length, output_token.value);
+        rc = ssh_buffer_pack(session->out_buffer,
+                             "bdP",
+                             SSH2_MSG_USERAUTH_GSSAPI_TOKEN,
+                             output_token.length,
+                             (size_t)output_token.length, output_token.value);
+        if (rc != SSH_OK) {
+            ssh_set_error_oom(session);
+            ssh_auth_reply_default(session, 0);
+            ssh_gssapi_free(session);
+            session->gssapi = NULL;
+            return SSH_PACKET_USED;
+        }
         ssh_packet_send(session);
     }
 
@@ -846,6 +853,7 @@
 }
 
 SSH_PACKET_CALLBACK(ssh_packet_userauth_gssapi_response){
+    int rc;
     ssh_string oid_s;
     gss_uint32 maj_stat, min_stat;
     gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
@@ -897,11 +905,15 @@
         hexa = ssh_get_hexa(output_token.value, output_token.length);
         SSH_LOG(SSH_LOG_PACKET, "GSSAPI: sending token %s", hexa);
         SAFE_FREE(hexa);
-        ssh_buffer_pack(session->out_buffer,
-                        "bdP",
-                        SSH2_MSG_USERAUTH_GSSAPI_TOKEN,
-                        output_token.length,
-                        (size_t)output_token.length, output_token.value);
+        rc = ssh_buffer_pack(session->out_buffer,
+                             "bdP",
+                             SSH2_MSG_USERAUTH_GSSAPI_TOKEN,
+                             output_token.length,
+                             (size_t)output_token.length, output_token.value);
+        if (rc != SSH_OK) {
+            ssh_set_error_oom(session);
+            goto error;
+        }
         ssh_packet_send(session);
         session->auth.state = SSH_AUTH_STATE_GSSAPI_TOKEN;
     }
@@ -963,6 +975,7 @@
 }
 
 SSH_PACKET_CALLBACK(ssh_packet_userauth_gssapi_token_client){
+    int rc;
     ssh_string token;
     char *hexa;
     OM_uint32 maj_stat, min_stat;
@@ -1015,11 +1028,15 @@
         hexa = ssh_get_hexa(output_token.value, output_token.length);
         SSH_LOG(SSH_LOG_PACKET, "GSSAPI: sending token %s",hexa);
         SAFE_FREE(hexa);
-        ssh_buffer_pack(session->out_buffer,
-                        "bdP",
-                        SSH2_MSG_USERAUTH_GSSAPI_TOKEN,
-                        output_token.length,
-                        (size_t)output_token.length, output_token.value);
+        rc = ssh_buffer_pack(session->out_buffer,
+                             "bdP",
+                             SSH2_MSG_USERAUTH_GSSAPI_TOKEN,
+                             output_token.length,
+                             (size_t)output_token.length, output_token.value);
+        if (rc != SSH_OK) {
+            ssh_set_error_oom(session);
+            goto error;
+        }
         ssh_packet_send(session);
     }
 
diff --color -ru ../libssh-0.9.6/src/options.c ./src/options.c
--- ../libssh-0.9.6/src/options.c	2021-08-26 14:27:42.000000000 +0200
+++ ./src/options.c	2023-05-03 11:58:22.000201044 +0200
@@ -547,7 +547,9 @@
                 }
                 i = strtol(q, &p, 10);
                 if (q == p) {
+                    SSH_LOG(SSH_LOG_DEBUG, "No port number was parsed");
                     SAFE_FREE(q);
+                    return -1;
                 }
                 SAFE_FREE(q);
                 if (i <= 0) {
@@ -743,7 +745,9 @@
                 }
                 i = strtol(q, &p, 10);
                 if (q == p) {
+                    SSH_LOG(SSH_LOG_DEBUG, "No log verbositiy was parsed");
                     SAFE_FREE(q);
+                    return -1;
                 }
                 SAFE_FREE(q);
                 if (i < 0) {
@@ -1818,7 +1822,9 @@
         }
         i = strtol(q, &p, 10);
         if (q == p) {
-          SAFE_FREE(q);
+            SSH_LOG(SSH_LOG_DEBUG, "No bind port was parsed");
+            SAFE_FREE(q);
+            return -1;
         }
         SAFE_FREE(q);
 
@@ -1845,7 +1851,9 @@
         }
         i = strtol(q, &p, 10);
         if (q == p) {
-          SAFE_FREE(q);
+            SSH_LOG(SSH_LOG_DEBUG, "No log verbositiy was parsed");
+            SAFE_FREE(q);
+            return -1;
         }
         SAFE_FREE(q);
 
diff --color -ru ../libssh-0.9.6/src/pki_container_openssh.c ./src/pki_container_openssh.c
--- ../libssh-0.9.6/src/pki_container_openssh.c	2023-05-03 11:53:48.713217785 +0200
+++ ./src/pki_container_openssh.c	2023-05-03 11:58:21.976200782 +0200
@@ -630,7 +630,11 @@
             goto error;
         }
 
-        ssh_buffer_pack(kdf_buf, "Sd", salt, rounds);
+        rc = ssh_buffer_pack(kdf_buf, "Sd", salt, rounds);
+        if (rc != SSH_OK) {
+            SSH_BUFFER_FREE(kdf_buf);
+            goto error;
+        }
         kdf_options = ssh_string_new(ssh_buffer_get_len(kdf_buf));
         if (kdf_options == NULL){
             SSH_BUFFER_FREE(kdf_buf);
diff --color -ru ../libssh-0.9.6/tests/unittests/torture_options.c ./tests/unittests/torture_options.c
--- ../libssh-0.9.6/tests/unittests/torture_options.c	2021-08-26 14:27:42.000000000 +0200
+++ ./tests/unittests/torture_options.c	2023-05-03 11:59:21.726853027 +0200
@@ -311,6 +311,7 @@
 
     rc = ssh_options_set(session, SSH_OPTIONS_PORT_STR, "five");
     assert_true(rc == -1);
+    assert_int_not_equal(session->opts.port, 0);
 
     rc = ssh_options_set(session, SSH_OPTIONS_PORT, NULL);
     assert_true(rc == -1);
@@ -853,6 +854,26 @@
     ssh_free(new);
 }
 
+static void torture_options_set_verbosity (void **state)
+{
+    ssh_session session = *state;
+    int rc, new_level;
+
+    rc = ssh_options_set(session,
+                         SSH_OPTIONS_LOG_VERBOSITY_STR,
+                         "3");
+    assert_int_equal(rc, SSH_OK);
+    new_level = ssh_get_log_level();
+    assert_int_equal(new_level, SSH_LOG_PACKET);
+
+    rc = ssh_options_set(session,
+                         SSH_OPTIONS_LOG_VERBOSITY_STR,
+                         "datsun");
+    assert_int_equal(rc, -1);
+    new_level = ssh_get_log_level();
+    assert_int_not_equal(new_level, 0);
+}
+
 #ifdef WITH_SERVER
 const char template[] = "temp_dir_XXXXXX";
 
@@ -1107,6 +1128,10 @@
     rc = ssh_bind_options_set(bind, SSH_BIND_OPTIONS_BINDPORT_STR, "23");
     assert_int_equal(rc, 0);
     assert_int_equal(bind->bindport, 23);
+
+    rc = ssh_bind_options_set(bind, SSH_BIND_OPTIONS_BINDPORT_STR, "twentythree");
+    assert_int_equal(rc, -1);
+    assert_int_not_equal(bind->bindport, 0);
 }
 
 static void torture_bind_options_log_verbosity(void **state)
@@ -1156,6 +1181,11 @@
     new_level = ssh_get_log_level();
     assert_int_equal(new_level, SSH_LOG_PACKET);
 
+    rc = ssh_bind_options_set(bind, SSH_BIND_OPTIONS_LOG_VERBOSITY_STR, "verbosity");
+    assert_int_equal(rc, -1);
+    new_level = ssh_get_log_level();
+    assert_int_not_equal(new_level, 0);
+
     rc = ssh_set_log_level(previous_level);
     assert_int_equal(rc, SSH_OK);
 }
@@ -1643,6 +1673,7 @@
         cmocka_unit_test_setup_teardown(torture_options_config_host, setup, teardown),
         cmocka_unit_test_setup_teardown(torture_options_config_match,
                                         setup, teardown),
+        cmocka_unit_test_setup_teardown(torture_options_set_verbosity, setup, teardown),
     };
 
 #ifdef WITH_SERVER