diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac6ac2632403f..526b4be689cc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -144,6 +144,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Replaces ZipInputStream with ZipFile to fix Zip Slip vulnerability ([#7230](https://github.com/opensearch-project/OpenSearch/pull/7230))
 - Add missing validation/parsing of SearchBackpressureMode of SearchBackpressureSettings ([#7541](https://github.com/opensearch-project/OpenSearch/pull/7541))
 - [Search Pipelines] Better exception handling in search pipelines ([#7735](https://github.com/opensearch-project/OpenSearch/pull/7735))
+- Fix input validation in segments and delete pit request ([#6645](https://github.com/opensearch-project/OpenSearch/pull/6645))
 
 ### Security
 
diff --git a/server/src/main/java/org/opensearch/action/admin/indices/segments/TransportPitSegmentsAction.java b/server/src/main/java/org/opensearch/action/admin/indices/segments/TransportPitSegmentsAction.java
index 5c22a39cf3a40..d843b3a9452a5 100644
--- a/server/src/main/java/org/opensearch/action/admin/indices/segments/TransportPitSegmentsAction.java
+++ b/server/src/main/java/org/opensearch/action/admin/indices/segments/TransportPitSegmentsAction.java
@@ -44,8 +44,10 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import static org.opensearch.action.search.SearchContextId.decode;
@@ -94,8 +96,7 @@ public TransportPitSegmentsAction(
      */
     @Override
     protected void doExecute(Task task, PitSegmentsRequest request, ActionListener<IndicesSegmentResponse> listener) {
-        List<String> pitIds = request.getPitIds();
-        if (pitIds.size() == 1 && "_all".equals(pitIds.get(0))) {
+        if (request.getPitIds().size() == 1 && "_all".equals(request.getPitIds().get(0))) {
             pitService.getAllPits(ActionListener.wrap(response -> {
                 request.clearAndSetPitIds(response.getPitInfos().stream().map(ListPitInfo::getPitId).collect(Collectors.toList()));
                 super.doExecute(task, request, listener);
@@ -114,7 +115,9 @@ protected void doExecute(Task task, PitSegmentsRequest request, ActionListener<I
     @Override
     protected ShardsIterator shards(ClusterState clusterState, PitSegmentsRequest request, String[] concreteIndices) {
         final ArrayList<ShardRouting> iterators = new ArrayList<>();
-        for (String pitId : request.getPitIds()) {
+        // remove duplicates from the request
+        Set<String> uniquePitIds = new LinkedHashSet<>(request.getPitIds());
+        for (String pitId : uniquePitIds) {
             SearchContextId searchContext = decode(namedWriteableRegistry, pitId);
             for (Map.Entry<ShardId, SearchContextIdForNode> entry : searchContext.shards().entrySet()) {
                 final SearchContextIdForNode perNode = entry.getValue();
diff --git a/server/src/main/java/org/opensearch/action/search/TransportDeletePitAction.java b/server/src/main/java/org/opensearch/action/search/TransportDeletePitAction.java
index b85fe302a748f..217fcc1489df7 100644
--- a/server/src/main/java/org/opensearch/action/search/TransportDeletePitAction.java
+++ b/server/src/main/java/org/opensearch/action/search/TransportDeletePitAction.java
@@ -18,8 +18,10 @@
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 /**
@@ -46,8 +48,7 @@ public TransportDeletePitAction(
      */
     @Override
     protected void doExecute(Task task, DeletePitRequest request, ActionListener<DeletePitResponse> listener) {
-        List<String> pitIds = request.getPitIds();
-        if (pitIds.size() == 1 && "_all".equals(pitIds.get(0))) {
+        if (request.getPitIds().size() == 1 && "_all".equals(request.getPitIds().get(0))) {
             deleteAllPits(listener);
         } else {
             deletePits(listener, request);
@@ -59,7 +60,9 @@ protected void doExecute(Task task, DeletePitRequest request, ActionListener<Del
      */
     private void deletePits(ActionListener<DeletePitResponse> listener, DeletePitRequest request) {
         Map<String, List<PitSearchContextIdForNode>> nodeToContextsMap = new HashMap<>();
-        for (String pitId : request.getPitIds()) {
+        // remove duplicates from the request
+        Set<String> uniquePitIds = new LinkedHashSet<>(request.getPitIds());
+        for (String pitId : uniquePitIds) {
             SearchContextId contextId = SearchContextId.decode(namedWriteableRegistry, pitId);
             for (SearchContextIdForNode contextIdForNode : contextId.shards().values()) {
                 PitSearchContextIdForNode pitSearchContext = new PitSearchContextIdForNode(pitId, contextIdForNode);