diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
--- a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
@@ -327,7 +327,7 @@
         PrologueOffset, TotalLength);
   }
   FormParams.Version = DebugLineData.getU16(OffsetPtr);
-  if (getVersion() < 2)
+  if (getVersion() < 2 || getVersion() > 5)
     // Treat this error as unrecoverable - we cannot be sure what any of
     // the data represents including the length field, so cannot skip it or make
     // any reasonable assumptions.
diff --git a/llvm/unittests/DebugInfo/DWARF/DWARFDebugLineTest.cpp b/llvm/unittests/DebugInfo/DWARF/DWARFDebugLineTest.cpp
--- a/llvm/unittests/DebugInfo/DWARF/DWARFDebugLineTest.cpp
+++ b/llvm/unittests/DebugInfo/DWARF/DWARFDebugLineTest.cpp
@@ -354,6 +354,21 @@
       "0x01");
 }
 
+TEST_F(DebugLineBasicFixture, ErrorForHighVersion) {
+  if (!setupGenerator())
+    return;
+
+  LineTable &LT = Gen->addLineTable();
+  LT.setCustomPrologue(
+      {{LineTable::Half, LineTable::Long}, {6, LineTable::Half}});
+
+  generate();
+
+  checkGetOrParseLineTableEmitsFatalError(
+      "parsing line table prologue at offset 0x00000000 found unsupported "
+      "version 0x06");
+}
+
 TEST_F(DebugLineBasicFixture, ErrorForInvalidV5IncludeDirTable) {
   if (!setupGenerator(5))
     return;