diff --git a/mysql-test/main/trigger.result b/mysql-test/main/trigger.result
index 08c1abd378d32..b708bf10f793e 100644
--- a/mysql-test/main/trigger.result
+++ b/mysql-test/main/trigger.result
@@ -3065,3 +3065,116 @@ TRIGGER_CATALOG	TRIGGER_SCHEMA	TRIGGER_NAME	EVENT_OBJECT_CATALOG	EVENT_OBJECT_SC
 DROP VIEW IF EXISTS vt;
 DROP TABLE t, t1;
 # End of 12.2 tests
+#
+# MDEV-40570: INSERT ... ON DUPLICATE KEY UPDATE reports the wrong
+#             INSERTING/UPDATING/DELETING flag in multi-event triggers
+#
+CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
+CREATE TABLE t2 (msg VARCHAR(20));
+CREATE TRIGGER t1_b_all BEFORE INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+IF INSERTING THEN
+INSERT INTO t2 VALUES ('BEFORE INSERTING');
+ELSEIF UPDATING THEN
+INSERT INTO t2 VALUES ('BEFORE UPDATING');
+ELSEIF DELETING THEN
+INSERT INTO t2 VALUES ('BEFORE DELETING');
+END IF;
+END
+$
+CREATE TRIGGER t1_a_all AFTER INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+IF INSERTING THEN
+INSERT INTO t2 VALUES ('AFTER INSERTING');
+ELSEIF UPDATING THEN
+INSERT INTO t2 VALUES ('AFTER UPDATING');
+ELSEIF DELETING THEN
+INSERT INTO t2 VALUES ('AFTER DELETING');
+END IF;
+END
+$
+# Ordinary INSERT fires INSERT triggers with the INSERTING flag set
+INSERT INTO t1 VALUES (1, 1);
+SELECT * FROM t2;
+msg
+BEFORE INSERTING
+AFTER INSERTING
+TRUNCATE TABLE t2;
+# INSERT ... ON DUPLICATE KEY UPDATE that hits a duplicate key first
+# fires INSERT triggers (INSERTING), then performs an update and so
+# must fire UPDATE triggers with the UPDATING flag set
+INSERT INTO t1 VALUES (1, 2) ON DUPLICATE KEY UPDATE b = 2;
+SELECT * FROM t2;
+msg
+BEFORE INSERTING
+BEFORE UPDATING
+AFTER UPDATING
+TRUNCATE TABLE t2;
+# ON DUPLICATE KEY UPDATE that doesn't change the row still fires
+# UPDATE triggers with the UPDATING flag set
+INSERT INTO t1 VALUES (1, 2) ON DUPLICATE KEY UPDATE b = 2;
+SELECT * FROM t2;
+msg
+BEFORE INSERTING
+BEFORE UPDATING
+AFTER UPDATING
+TRUNCATE TABLE t2;
+# REPLACE on a duplicate key fires INSERT triggers (INSERTING) and
+# DELETE triggers with the DELETING flag set
+REPLACE INTO t1 VALUES (1, 3);
+SELECT * FROM t2;
+msg
+BEFORE INSERTING
+BEFORE DELETING
+AFTER DELETING
+AFTER INSERTING
+TRUNCATE TABLE t2;
+DROP TABLE t1, t2;
+#
+# Check the same for INSERT ... SELECT ... ON DUPLICATE KEY UPDATE
+# and REPLACE ... SELECT
+#
+CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
+CREATE TABLE t2 (msg VARCHAR(20));
+CREATE TABLE t3 (a INT, b INT);
+INSERT INTO t3 VALUES (1, 2);
+CREATE TRIGGER t1_b_all BEFORE INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+IF INSERTING THEN
+INSERT INTO t2 VALUES ('BEFORE INSERTING');
+ELSEIF UPDATING THEN
+INSERT INTO t2 VALUES ('BEFORE UPDATING');
+ELSEIF DELETING THEN
+INSERT INTO t2 VALUES ('BEFORE DELETING');
+END IF;
+END
+$
+CREATE TRIGGER t1_a_all AFTER INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+IF INSERTING THEN
+INSERT INTO t2 VALUES ('AFTER INSERTING');
+ELSEIF UPDATING THEN
+INSERT INTO t2 VALUES ('AFTER UPDATING');
+ELSEIF DELETING THEN
+INSERT INTO t2 VALUES ('AFTER DELETING');
+END IF;
+END
+$
+INSERT INTO t1 VALUES (1, 1);
+TRUNCATE TABLE t2;
+INSERT INTO t1 SELECT * FROM t3 ON DUPLICATE KEY UPDATE b = 2;
+SELECT * FROM t2;
+msg
+BEFORE INSERTING
+BEFORE UPDATING
+AFTER UPDATING
+TRUNCATE TABLE t2;
+REPLACE INTO t1 SELECT a, b + 1 FROM t3;
+SELECT * FROM t2;
+msg
+BEFORE INSERTING
+BEFORE DELETING
+AFTER DELETING
+AFTER INSERTING
+DROP TABLE t1, t2, t3;
+# End of 12.3 tests
diff --git a/mysql-test/main/trigger.test b/mysql-test/main/trigger.test
index 16a99c905c68f..44b78e88a371b 100644
--- a/mysql-test/main/trigger.test
+++ b/mysql-test/main/trigger.test
@@ -3404,3 +3404,110 @@ DROP VIEW IF EXISTS vt;
 DROP TABLE t, t1;
 
 --echo # End of 12.2 tests
+
+--echo #
+--echo # MDEV-40570: INSERT ... ON DUPLICATE KEY UPDATE reports the wrong
+--echo #             INSERTING/UPDATING/DELETING flag in multi-event triggers
+--echo #
+
+CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
+CREATE TABLE t2 (msg VARCHAR(20));
+
+--delimiter $
+CREATE TRIGGER t1_b_all BEFORE INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+  IF INSERTING THEN
+    INSERT INTO t2 VALUES ('BEFORE INSERTING');
+  ELSEIF UPDATING THEN
+    INSERT INTO t2 VALUES ('BEFORE UPDATING');
+  ELSEIF DELETING THEN
+    INSERT INTO t2 VALUES ('BEFORE DELETING');
+  END IF;
+END
+$
+CREATE TRIGGER t1_a_all AFTER INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+  IF INSERTING THEN
+    INSERT INTO t2 VALUES ('AFTER INSERTING');
+  ELSEIF UPDATING THEN
+    INSERT INTO t2 VALUES ('AFTER UPDATING');
+  ELSEIF DELETING THEN
+    INSERT INTO t2 VALUES ('AFTER DELETING');
+  END IF;
+END
+$
+--delimiter ;
+
+--echo # Ordinary INSERT fires INSERT triggers with the INSERTING flag set
+INSERT INTO t1 VALUES (1, 1);
+SELECT * FROM t2;
+TRUNCATE TABLE t2;
+
+--echo # INSERT ... ON DUPLICATE KEY UPDATE that hits a duplicate key first
+--echo # fires INSERT triggers (INSERTING), then performs an update and so
+--echo # must fire UPDATE triggers with the UPDATING flag set
+INSERT INTO t1 VALUES (1, 2) ON DUPLICATE KEY UPDATE b = 2;
+SELECT * FROM t2;
+TRUNCATE TABLE t2;
+
+--echo # ON DUPLICATE KEY UPDATE that doesn't change the row still fires
+--echo # UPDATE triggers with the UPDATING flag set
+INSERT INTO t1 VALUES (1, 2) ON DUPLICATE KEY UPDATE b = 2;
+SELECT * FROM t2;
+TRUNCATE TABLE t2;
+
+--echo # REPLACE on a duplicate key fires INSERT triggers (INSERTING) and
+--echo # DELETE triggers with the DELETING flag set
+REPLACE INTO t1 VALUES (1, 3);
+SELECT * FROM t2;
+TRUNCATE TABLE t2;
+
+DROP TABLE t1, t2;
+
+--echo #
+--echo # Check the same for INSERT ... SELECT ... ON DUPLICATE KEY UPDATE
+--echo # and REPLACE ... SELECT
+--echo #
+CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
+CREATE TABLE t2 (msg VARCHAR(20));
+CREATE TABLE t3 (a INT, b INT);
+INSERT INTO t3 VALUES (1, 2);
+
+--delimiter $
+CREATE TRIGGER t1_b_all BEFORE INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+  IF INSERTING THEN
+    INSERT INTO t2 VALUES ('BEFORE INSERTING');
+  ELSEIF UPDATING THEN
+    INSERT INTO t2 VALUES ('BEFORE UPDATING');
+  ELSEIF DELETING THEN
+    INSERT INTO t2 VALUES ('BEFORE DELETING');
+  END IF;
+END
+$
+CREATE TRIGGER t1_a_all AFTER INSERT OR UPDATE OR DELETE ON t1 FOR EACH ROW
+BEGIN
+  IF INSERTING THEN
+    INSERT INTO t2 VALUES ('AFTER INSERTING');
+  ELSEIF UPDATING THEN
+    INSERT INTO t2 VALUES ('AFTER UPDATING');
+  ELSEIF DELETING THEN
+    INSERT INTO t2 VALUES ('AFTER DELETING');
+  END IF;
+END
+$
+--delimiter ;
+
+INSERT INTO t1 VALUES (1, 1);
+TRUNCATE TABLE t2;
+
+INSERT INTO t1 SELECT * FROM t3 ON DUPLICATE KEY UPDATE b = 2;
+SELECT * FROM t2;
+TRUNCATE TABLE t2;
+
+REPLACE INTO t1 SELECT a, b + 1 FROM t3;
+SELECT * FROM t2;
+
+DROP TABLE t1, t2, t3;
+
+--echo # End of 12.3 tests
diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index 60668384b3e2c..1ed567a088079 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -2194,6 +2194,12 @@ int Write_record::replace_row(ha_rows *inserted, ha_rows *deleted)
       DBUG_PRINT("info", ("Deleting offending row and trying to write"
                           " new one again"));
 
+      /*
+        Make the DELETE triggers fired below see the DELETING clause
+        set to true
+      */
+      Running_stmt_guard stmt_guard(thd, active_dml_stmt::DELETING_STMT);
+
       auto *trg = table->triggers;
       bool trg_skip_row= false;
       if (use_triggers && trg->process_triggers(table->in_use, TRG_EVENT_DELETE,
@@ -2262,6 +2268,12 @@ int Write_record::insert_on_duplicate_update(ha_rows *inserted,
   DBUG_ASSERT(info->update_fields->elements ==
               info->update_values->elements);
 
+  /*
+    Make the UPDATE triggers fired below see the UPDATING clause
+    set to true
+  */
+  Running_stmt_guard stmt_guard(thd, active_dml_stmt::UPDATING_STMT);
+
   bool trg_skip_row= false;
   if (fill_record_n_invoke_before_triggers(thd, table,
                                            *info->update_fields,
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 496426cf0447c..16a58871bb8f3 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -4545,6 +4545,7 @@ mysql_execute_command(THD *thd, bool is_called_from_prepared_stmt)
   case SQLCOM_INSERT_SELECT:
   {
     WSREP_SYNC_WAIT(thd, WSREP_SYNC_WAIT_BEFORE_INSERT_REPLACE);
+    Running_stmt_guard guard(thd, active_dml_stmt::INSERTING_STMT);
     select_insert *sel_result;
     select_result *result= NULL;
     bool explain= MY_TEST(lex->describe);