diff --git a/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp b/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp
index 3ee4d8d536ab..9e0dd165cf09 100644
--- a/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp
+++ b/ydb/core/kqp/ut/scheme/kqp_constraints_ut.cpp
@@ -782,12 +782,15 @@ Y_UNIT_TEST_SUITE(KqpConstraints) {
         TKikimrRunner kikimr(TKikimrSettings()
             .SetUseRealThreads(false)
             .SetEnableAddColumsWithDefaults(true)
+            .SetDisableMissingDefaultColumnsInBulkUpsert(true)
             .SetWithSampleTables(false));
 
         auto db = kikimr.RunCall([&] { return kikimr.GetQueryClient(); } );
         auto session = kikimr.RunCall([&] { return db.GetSession().GetValueSync().GetSession(); } );
         auto querySession = kikimr.RunCall([&] { return db.GetSession().GetValueSync().GetSession(); } );
 
+        auto tableClient = kikimr.RunCall([&] { return kikimr.GetTableClient(); } );
+
         auto& runtime = *kikimr.GetTestServer().GetRuntime();
 
         {
@@ -860,7 +863,7 @@ Y_UNIT_TEST_SUITE(KqpConstraints) {
 
         auto alterQuery = R"(
             ALTER TABLE `/Root/AddNonColumnDoesnotReturnInternalError`
-            ADD COLUMN Value3 Int32 NOT NULL DEFAULT 7;
+            ADD COLUMN Value3 Int32 DEFAULT 7;
         )";
 
         auto alterFuture = kikimr.RunInThreadPool([&] { return session.ExecuteQuery(alterQuery, TTxControl::NoTx()).GetValueSync(); });
@@ -894,6 +897,29 @@ Y_UNIT_TEST_SUITE(KqpConstraints) {
             UNIT_ASSERT_STRING_CONTAINS(result, R"([[1u;"Changed";"Updated"];[2u;"New";"text"]])");
         }
 
+        {
+            auto rowsBuilder = NYdb::TValueBuilder();
+            rowsBuilder.BeginList();
+            for (ui32 i = 10; i <= 15; ++i) {
+                rowsBuilder.AddListItem()
+                    .BeginStruct()
+                    .AddMember("Key")
+                        .Uint32(i)
+                    .AddMember("Value")
+                        .String("String")
+                    .AddMember("Value2")
+                        .String("String2")
+                    .EndStruct();
+
+            }
+            rowsBuilder.EndList();
+            auto result = kikimr.RunCall([&] {
+                return tableClient.BulkUpsert("/Root/AddNonColumnDoesnotReturnInternalError", rowsBuilder.Build()).GetValueSync();
+            });
+            UNIT_ASSERT_VALUES_EQUAL_C(result.GetStatus(), NYdb::EStatus::SCHEME_ERROR, result.GetIssues().ToString());
+            UNIT_ASSERT_STRING_CONTAINS(result.GetIssues().ToString(), "Missing default columns: Value3");
+        }
+
         {
             TString result = fQuery(R"(
                 UPSERT INTO `/Root/AddNonColumnDoesnotReturnInternalError` (Key, Value, Value2, Value3) VALUES (1, "4", "four", 1);
@@ -933,8 +959,8 @@ Y_UNIT_TEST_SUITE(KqpConstraints) {
 
         auto result = runtime.WaitFuture(alterFuture);
         fCompareTable(R"([
-            [1u;"Changed";"Updated";7];
-            [2u;"New";"text";7]
+            [1u;"Changed";"Updated";[7]];
+            [2u;"New";"text";[7]]
         ])");
     }
 
@@ -1513,6 +1539,81 @@ Y_UNIT_TEST_SUITE(KqpConstraints) {
         }
     }
 
+    Y_UNIT_TEST_TWIN(DefaultColumnAndBulkUpsert, DisableMissingDefaultColumnsInBulkUpsert) {
+        TKikimrRunner kikimr(TKikimrSettings()
+            .SetEnableAddColumsWithDefaults(true)
+            .SetDisableMissingDefaultColumnsInBulkUpsert(DisableMissingDefaultColumnsInBulkUpsert)
+            .SetWithSampleTables(false));
+
+        auto queryClient = kikimr.GetQueryClient();
+        auto tableClient = kikimr.GetTableClient();
+
+        {
+            auto query = R"(
+                CREATE TABLE `/Root/DefaultColumnAndBulkUpsert` (
+                    Key Uint32 NOT NULL,
+                    Value1 String DEFAULT "Default value",
+                    Value2 Int64 DEFAULT 123,
+                    PRIMARY KEY (Key),
+                );
+            )";
+
+            auto result = queryClient.ExecuteQuery(query, TTxControl::NoTx()).GetValueSync();
+            UNIT_ASSERT_C(result.IsSuccess(), result.GetIssues().ToString());
+        }
+
+        {
+            auto query = R"(
+                UPSERT INTO `/Root/DefaultColumnAndBulkUpsert` (Key) VALUES (1), (2);
+            )";
+
+            auto result = queryClient.ExecuteQuery(query, TTxControl::NoTx()).GetValueSync();
+            UNIT_ASSERT_C(result.IsSuccess(), result.GetIssues().ToString());
+        }
+
+        {
+            auto query = R"(
+                UPSERT INTO `/Root/DefaultColumnAndBulkUpsert` (Key, Value1) VALUES (3, "Value1"), (4, "Value2");
+            )";
+
+            auto result = queryClient.ExecuteQuery(query, TTxControl::NoTx()).GetValueSync();
+            UNIT_ASSERT_C(result.IsSuccess(), result.GetIssues().ToString());
+        }
+
+        {
+            auto query = R"(
+                ALTER TABLE `/Root/DefaultColumnAndBulkUpsert` ADD COLUMN Value3 Utf8 DEFAULT "Value3"u;
+            )";
+
+            auto result = queryClient.ExecuteQuery(query, TTxControl::NoTx()).GetValueSync();
+            UNIT_ASSERT_C(result.IsSuccess(), result.GetIssues().ToString());
+        }
+
+        {
+            auto rowsBuilder = NYdb::TValueBuilder();
+            rowsBuilder.BeginList();
+            for (ui32 i = 10; i <= 15; ++i) {
+                rowsBuilder.AddListItem()
+                    .BeginStruct()
+                    .AddMember("Key")
+                        .Uint32(i)
+                    .AddMember("Value2")
+                        .OptionalInt64(0)
+                    .EndStruct();
+
+            }
+            rowsBuilder.EndList();
+
+            auto result = tableClient.BulkUpsert("/Root/DefaultColumnAndBulkUpsert", rowsBuilder.Build()).ExtractValueSync();
+            if (DisableMissingDefaultColumnsInBulkUpsert) {
+                UNIT_ASSERT_VALUES_EQUAL_C(result.GetStatus(), NYdb::EStatus::SCHEME_ERROR, result.GetIssues().ToString());
+                UNIT_ASSERT_STRING_CONTAINS(result.GetIssues().ToString(), "Missing default columns: Value3, Value1");
+            } else {
+                UNIT_ASSERT_VALUES_EQUAL_C(result.GetStatus(), NYdb::EStatus::SUCCESS, result.GetIssues().ToString());
+            }
+        }
+    }
+
     // Y_UNIT_TEST(SetNotNull) {
     //     struct TValue {
     //     private:
diff --git a/ydb/core/protos/feature_flags.proto b/ydb/core/protos/feature_flags.proto
index c8c9150fa257..dc97922d02c5 100644
--- a/ydb/core/protos/feature_flags.proto
+++ b/ydb/core/protos/feature_flags.proto
@@ -232,4 +232,5 @@ message TFeatureFlags {
     optional bool EnableStreamingQueries = 206 [default = false];
     optional bool EnableTinyDisks = 207 [default = false];
     optional bool EnableMetricsLevel = 208 [default = false];
+    optional bool DisableMissingDefaultColumnsInBulkUpsert = 215 [default = false];
 }
diff --git a/ydb/core/testlib/basics/feature_flags.h b/ydb/core/testlib/basics/feature_flags.h
index 892be45b029d..de2723fe82c1 100644
--- a/ydb/core/testlib/basics/feature_flags.h
+++ b/ydb/core/testlib/basics/feature_flags.h
@@ -82,6 +82,7 @@ class TTestFeatureFlagsHolder {
     FEATURE_FLAG_SETTER(EnableRealSystemViewPaths)
     FEATURE_FLAG_SETTER(EnableDataShardWriteAlwaysVolatile)
     FEATURE_FLAG_SETTER(EnableStreamingQueries)
+    FEATURE_FLAG_SETTER(DisableMissingDefaultColumnsInBulkUpsert)
 
     #undef FEATURE_FLAG_SETTER
 };
diff --git a/ydb/core/tx/tx_proxy/upload_rows_common_impl.h b/ydb/core/tx/tx_proxy/upload_rows_common_impl.h
index cee04b57a975..f2cc69c9279b 100644
--- a/ydb/core/tx/tx_proxy/upload_rows_common_impl.h
+++ b/ydb/core/tx/tx_proxy/upload_rows_common_impl.h
@@ -381,6 +381,7 @@ class TUploadRowsBase : public TActorBootstrapped<TUploadRowsBase<DerivedActivit
         THashMap<TString, ui32> columnByName;
         THashSet<TString> keyColumnsLeft;
         THashSet<TString> notNullColumnsLeft = entry.NotNullColumns;
+        THashSet<TString> defaultColumnsLeft;
         SrcColumns.reserve(entry.Columns.size());
         THashSet<TString> HasInternalConversion;
 
@@ -400,6 +401,10 @@ class TUploadRowsBase : public TActorBootstrapped<TUploadRowsBase<DerivedActivit
                 keyColumnIds[keyOrder] = id;
                 keyColumnsLeft.insert(name);
             }
+
+            if (colInfo.IsDefaultFromLiteral()) {
+                defaultColumnsLeft.insert(name);
+            }
         }
 
         if (entry.ColumnTableInfo) {
@@ -498,6 +503,10 @@ class TUploadRowsBase : public TActorBootstrapped<TUploadRowsBase<DerivedActivit
                 NotNullColumns.emplace(ci.Name);
             }
 
+            if (defaultColumnsLeft.contains(ci.Name)) {
+                defaultColumnsLeft.erase(ci.Name);
+            }
+
             if (ci.KeyOrder != -1) {
                 KeyColumnPositions[ci.KeyOrder] = TFieldDescription{ci.Id, ci.Name, (ui32)pos, ci.PType, pgTypeMod, notNull};
                 keyColumnsLeft.erase(ci.Name);
@@ -582,6 +591,21 @@ class TUploadRowsBase : public TActorBootstrapped<TUploadRowsBase<DerivedActivit
             return TConclusionStatus::Fail(Sprintf("Missing not null columns: %s", JoinSeq(", ", notNullColumnsLeft).c_str()));
         }
 
+        if (!defaultColumnsLeft.empty() && UpsertIfExists) {
+            // some default columns are not specified in the request, but upsert will only update existing rows
+            // and only the columns specified in the request will be updated; unspecified default columns will not be changed.
+            defaultColumnsLeft.clear();
+        }
+
+        if (!defaultColumnsLeft.empty()) {
+            if (AppData(ctx)->FeatureFlags.GetDisableMissingDefaultColumnsInBulkUpsert()) {
+                return TConclusionStatus::Fail(Sprintf("Missing default columns: %s", JoinSeq(", ", defaultColumnsLeft).c_str()));
+            }
+
+            UploadCounters.OnMissingDefaultColumns();
+            LOG_WARN_S(ctx, NKikimrServices::RPC_REQUEST, "Missing default columns: " << JoinSeq(", ", defaultColumnsLeft).c_str());
+        }
+
         TConclusionStatus res = TConclusionStatus::Success();
         if (isColumnTable && HasAppData() && AppDataVerified().ColumnShardConfig.GetBulkUpsertRequireAllColumns()) {
             res = CheckRequiredColumns(entry, *reqColumns);
diff --git a/ydb/core/tx/tx_proxy/upload_rows_counters.cpp b/ydb/core/tx/tx_proxy/upload_rows_counters.cpp
index 9e39f37298cf..16fbd5ed4acc 100644
--- a/ydb/core/tx/tx_proxy/upload_rows_counters.cpp
+++ b/ydb/core/tx/tx_proxy/upload_rows_counters.cpp
@@ -99,5 +99,6 @@ TUploadCounters::TUploadCounters()
             WrittenBytes = TBase::GetDeriviative("Replies/WrittenBytes");
             FailedBytes = TBase::GetDeriviative("Replies/FailedBytes");
             RequestsBytes = TBase::GetDeriviative("Requests/Bytes");
+            MissingDefaultColumnsCount = TBase::GetDeriviative("MissingDefaultColumns/Count");
 }
 }
diff --git a/ydb/core/tx/tx_proxy/upload_rows_counters.h b/ydb/core/tx/tx_proxy/upload_rows_counters.h
index b71e94b3ab24..76d6cea85134 100644
--- a/ydb/core/tx/tx_proxy/upload_rows_counters.h
+++ b/ydb/core/tx/tx_proxy/upload_rows_counters.h
@@ -76,6 +76,8 @@ class TUploadCounters: public NColumnShard::TCommonCountersOwner {
     NMonitoring::TDynamicCounters::TCounterPtr FailedBytes;
     NMonitoring::TDynamicCounters::TCounterPtr RequestsBytes;
 
+    NMonitoring::TDynamicCounters::TCounterPtr MissingDefaultColumnsCount;
+
     THashMap<TUploadStatus, NMonitoring::TDynamicCounters::TCounterPtr, TUploadStatus::THasher> CodesCount;
 
     NMonitoring::TDynamicCounters::TCounterPtr GetCodeCounter(const TUploadStatus& status);
@@ -142,6 +144,10 @@ class TUploadCounters: public NColumnShard::TCommonCountersOwner {
         PackageSizeCountByRecords->Collect(rowsCount);
         RequestsBytes->Add(requestBytes);
     }
+
+    void OnMissingDefaultColumns() {
+        MissingDefaultColumnsCount->Inc();
+    }
 };
 
 }   // namespace NKikimr