diff --git a/.changelog/30214.txt b/.changelog/30214.txt
new file mode 100644
index 000000000000..7628c89a6552
--- /dev/null
+++ b/.changelog/30214.txt
@@ -0,0 +1,11 @@
+```release-note:bug
+datasource/aws_ecs_task_execution: Fix type assertion panic on `overrides.0.inference_accelerator_overrides` attribute
+```
+
+```release-note:bug
+datasource/aws_ecs_task_execution: Fix type assertion panic on `overrides.0.container_overrides.*.environment` attribute
+```
+
+```release-note:bug
+datasource/aws_ecs_task_execution: Fix type assertion panic on `overrides.0.container_overrides.*.resource_requirements` attribute
+```
diff --git a/internal/service/ecs/task_execution_data_source.go b/internal/service/ecs/task_execution_data_source.go
index 0057cce6b3da..75e82b76d6cb 100644
--- a/internal/service/ecs/task_execution_data_source.go
+++ b/internal/service/ecs/task_execution_data_source.go
@@ -361,6 +361,7 @@ func expandTaskOverride(tfList []interface{}) *ecs.TaskOverride {
 	if len(tfList) == 0 {
 		return nil
 	}
+
 	apiObject := &ecs.TaskOverride{}
 	tfMap := tfList[0].(map[string]interface{})
 
@@ -377,7 +378,7 @@ func expandTaskOverride(tfList []interface{}) *ecs.TaskOverride {
 		apiObject.TaskRoleArn = aws.String(v.(string))
 	}
 	if v, ok := tfMap["inference_accelerator_overrides"]; ok {
-		apiObject.InferenceAcceleratorOverrides = expandInferenceAcceleratorOverrides(v.([]interface{}))
+		apiObject.InferenceAcceleratorOverrides = expandInferenceAcceleratorOverrides(v.(*schema.Set))
 	}
 	if v, ok := tfMap["container_overrides"]; ok {
 		apiObject.ContainerOverrides = expandContainerOverride(v.([]interface{}))
@@ -386,13 +387,13 @@ func expandTaskOverride(tfList []interface{}) *ecs.TaskOverride {
 	return apiObject
 }
 
-func expandInferenceAcceleratorOverrides(tfList []interface{}) []*ecs.InferenceAcceleratorOverride {
-	if len(tfList) == 0 {
+func expandInferenceAcceleratorOverrides(tfSet *schema.Set) []*ecs.InferenceAcceleratorOverride {
+	if tfSet.Len() == 0 {
 		return nil
 	}
 	apiObject := make([]*ecs.InferenceAcceleratorOverride, 0)
 
-	for _, item := range tfList {
+	for _, item := range tfSet.List() {
 		tfMap := item.(map[string]interface{})
 		iao := &ecs.InferenceAcceleratorOverride{
 			DeviceName: aws.String(tfMap["device_name"].(string)),
@@ -420,19 +421,19 @@ func expandContainerOverride(tfList []interface{}) []*ecs.ContainerOverride {
 			co.Command = flex.ExpandStringList(commandStrings)
 		}
 		if v, ok := tfMap["cpu"]; ok {
-			co.Cpu = aws.Int64(v.(int64))
+			co.Cpu = aws.Int64(int64(v.(int)))
 		}
 		if v, ok := tfMap["environment"]; ok {
-			co.Environment = expandTaskEnvironment(v.([]interface{}))
+			co.Environment = expandTaskEnvironment(v.(*schema.Set))
 		}
 		if v, ok := tfMap["memory"]; ok {
-			co.Memory = aws.Int64(v.(int64))
+			co.Memory = aws.Int64(int64(v.(int)))
 		}
 		if v, ok := tfMap["memory_reservation"]; ok {
-			co.Memory = aws.Int64(v.(int64))
+			co.Memory = aws.Int64(int64(v.(int)))
 		}
 		if v, ok := tfMap["resource_requirements"]; ok {
-			co.ResourceRequirements = expandResourceRequirements(v.([]interface{}))
+			co.ResourceRequirements = expandResourceRequirements(v.(*schema.Set))
 		}
 		apiObject = append(apiObject, co)
 	}
@@ -440,16 +441,16 @@ func expandContainerOverride(tfList []interface{}) []*ecs.ContainerOverride {
 	return apiObject
 }
 
-func expandTaskEnvironment(tfList []interface{}) []*ecs.KeyValuePair {
-	if len(tfList) == 0 {
+func expandTaskEnvironment(tfSet *schema.Set) []*ecs.KeyValuePair {
+	if tfSet.Len() == 0 {
 		return nil
 	}
 	apiObject := make([]*ecs.KeyValuePair, 0)
 
-	for _, item := range tfList {
+	for _, item := range tfSet.List() {
 		tfMap := item.(map[string]interface{})
 		te := &ecs.KeyValuePair{
-			Name:  aws.String(tfMap["name"].(string)),
+			Name:  aws.String(tfMap["key"].(string)),
 			Value: aws.String(tfMap["value"].(string)),
 		}
 		apiObject = append(apiObject, te)
@@ -458,13 +459,13 @@ func expandTaskEnvironment(tfList []interface{}) []*ecs.KeyValuePair {
 	return apiObject
 }
 
-func expandResourceRequirements(tfList []interface{}) []*ecs.ResourceRequirement {
-	if len(tfList) == 0 {
+func expandResourceRequirements(tfSet *schema.Set) []*ecs.ResourceRequirement {
+	if tfSet.Len() == 0 {
 		return nil
 	}
 
 	apiObject := make([]*ecs.ResourceRequirement, 0)
-	for _, item := range tfList {
+	for _, item := range tfSet.List() {
 		tfMap := item.(map[string]interface{})
 		rr := &ecs.ResourceRequirement{
 			Type:  aws.String(tfMap["type"].(string)),
diff --git a/internal/service/ecs/task_execution_data_source_test.go b/internal/service/ecs/task_execution_data_source_test.go
index 7b8a4da08f90..a08a9ef67217 100644
--- a/internal/service/ecs/task_execution_data_source_test.go
+++ b/internal/service/ecs/task_execution_data_source_test.go
@@ -44,6 +44,45 @@ func TestAccECSTaskExecutionDataSource_basic(t *testing.T) {
 	})
 }
 
+func TestAccECSTaskExecutionDataSource_overrides(t *testing.T) {
+	ctx := acctest.Context(t)
+	if testing.Short() {
+		t.Skip("skipping long-running test in short mode")
+	}
+
+	rName := sdkacctest.RandomWithPrefix(acctest.ResourcePrefix)
+	dataSourceName := "data.aws_ecs_task_execution.test"
+	clusterName := "aws_ecs_cluster.test"
+	taskDefinitionName := "aws_ecs_task_definition.test"
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck: func() {
+			acctest.PreCheck(ctx, t)
+			acctest.PreCheckPartitionHasService(t, ecs.EndpointsID)
+		},
+		ErrorCheck:               acctest.ErrorCheck(t, ecs.EndpointsID),
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccTaskExecutionDataSourceConfig_overrides(rName, "key1", "value1"),
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestCheckResourceAttrPair(dataSourceName, "cluster", clusterName, "id"),
+					resource.TestCheckResourceAttrPair(dataSourceName, "task_definition", taskDefinitionName, "arn"),
+					resource.TestCheckResourceAttr(dataSourceName, "desired_count", "1"),
+					resource.TestCheckResourceAttr(dataSourceName, "launch_type", "FARGATE"),
+					resource.TestCheckResourceAttr(dataSourceName, "network_configuration.#", "1"),
+					resource.TestCheckResourceAttr(dataSourceName, "task_arns.#", "1"),
+					resource.TestCheckResourceAttr(dataSourceName, "overrides.#", "1"),
+					resource.TestCheckResourceAttr(dataSourceName, "overrides.0.container_overrides.#", "1"),
+					resource.TestCheckResourceAttr(dataSourceName, "overrides.0.container_overrides.0.environment.#", "1"),
+					resource.TestCheckResourceAttr(dataSourceName, "overrides.0.container_overrides.0.environment.0.key", "key1"),
+					resource.TestCheckResourceAttr(dataSourceName, "overrides.0.container_overrides.0.environment.0.value", "value1"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccECSTaskExecutionDataSource_tags(t *testing.T) {
 	ctx := acctest.Context(t)
 	if testing.Short() {
@@ -181,3 +220,38 @@ data "aws_ecs_task_execution" "test" {
 }
 `, tagKey1, tagValue1))
 }
+
+func testAccTaskExecutionDataSourceConfig_overrides(rName, envKey1, envValue1 string) string {
+	return acctest.ConfigCompose(
+		acctest.ConfigVPCWithSubnets(rName, 2),
+		testAccTaskExecutionDataSourceConfig_base(rName),
+		fmt.Sprintf(`
+data "aws_ecs_task_execution" "test" {
+  depends_on = [aws_ecs_cluster_capacity_providers.test]
+
+  cluster         = aws_ecs_cluster.test.id
+  task_definition = aws_ecs_task_definition.test.arn
+  desired_count   = 1
+  launch_type     = "FARGATE"
+
+  network_configuration {
+    subnets          = aws_subnet.test[*].id
+    security_groups  = [aws_security_group.test.id]
+    assign_public_ip = false
+  }
+
+  overrides {
+    container_overrides {
+      name = "sleep"
+
+      environment {
+        key   = %[1]q
+        value = %[2]q
+      }
+    }
+    cpu    = "256"
+    memory = "512"
+  }
+}
+`, envKey1, envValue1))
+}