diff --git a/Source/MediaInfo/Audio/File_Dts.cpp b/Source/MediaInfo/Audio/File_Dts.cpp
index bc8990678..cf79f95f3 100644
--- a/Source/MediaInfo/Audio/File_Dts.cpp
+++ b/Source/MediaInfo/Audio/File_Dts.cpp
@@ -1692,6 +1692,8 @@ void File_Dts::Extensions()
                 default:
                     Extensions_Resynch(false);
             }
+            if (Element_Offset>Element_Size)
+                Element_Offset=Element_Size; //Prevent unsigned underflow in loop condition if handler left offset past asset boundary
             Element_End0();
         }
         Element_Size=Element_Size_Save;
@@ -1946,6 +1948,13 @@ void File_Dts::XLL()
         return;
     }
     auto Element_Size_Save=Element_Size;
+    if (Element_Offset_Start-3+LLFrameSize>Element_Size_Save)
+    {
+        BS_End();
+        Element_End0();
+        Skip_XX(Element_Size-Element_Offset,                    "(Unknown)");
+        return;
+    }
     Element_Size=Element_Offset_Start-3+LLFrameSize;
     Get_S1 (4, NumChSetsInFrame,                                "NumChSetsInFrame");
     NumChSetsInFrame++; Param_Info1(NumChSetsInFrame);