diff --git a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/connections.py b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/connections.py
index 744dff444fd3e..5492487377048 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/connections.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/connections.py
@@ -203,8 +203,12 @@ def patch_connection(
             status.HTTP_404_NOT_FOUND, f"The Connection with connection_id: `{connection_id}` was not found"
         )
 
+    fields_to_update = patch_body.model_fields_set
+    if update_mask:
+        fields_to_update = fields_to_update.intersection(update_mask)
+
     try:
-        ConnectionBody(**patch_body.model_dump())
+        ConnectionBody(**patch_body.model_dump(include=fields_to_update))
     except ValidationError as e:
         raise RequestValidationError(errors=e.errors())
 
diff --git a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/dags.py b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/dags.py
index f4c9186cd2fca..cec2d7ca9a5d9 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/routes/public/dags.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/routes/public/dags.py
@@ -286,11 +286,11 @@ def patch_dag(
                 status.HTTP_400_BAD_REQUEST, "Only `is_paused` field can be updated through the REST API"
             )
         fields_to_update = fields_to_update.intersection(update_mask)
-    else:
-        try:
-            DAGPatchBody(**patch_body.model_dump())
-        except ValidationError as e:
-            raise RequestValidationError(errors=e.errors())
+
+    try:
+        DAGPatchBody(**patch_body.model_dump(include=fields_to_update))
+    except ValidationError as e:
+        raise RequestValidationError(errors=e.errors())
 
     data = patch_body.model_dump(include=fields_to_update, by_alias=True)
 
diff --git a/airflow-core/src/airflow/api_fastapi/core_api/services/public/variables.py b/airflow-core/src/airflow/api_fastapi/core_api/services/public/variables.py
index a5011768cb0aa..e7a05567bb451 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/services/public/variables.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/services/public/variables.py
@@ -65,11 +65,15 @@ def update_orm_from_pydantic(
             status.HTTP_404_NOT_FOUND, f"The Variable with key: `{variable_key}` was not found"
         )
 
+    non_update_fields = {"key"}
+    fields_to_update = patch_body.model_fields_set
+    if update_mask:
+        fields_to_update = fields_to_update.intersection(update_mask)
+
     try:
-        VariableBody(**patch_body.model_dump())
+        VariableBody(**patch_body.model_dump(include=fields_to_update))
     except ValidationError as e:
         raise RequestValidationError(errors=e.errors())
-    non_update_fields = {"key"}
 
     if patch_body.key != old_variable.key:
         raise HTTPException(