diff --git a/Core/GameEngine/Include/Common/MapReaderWriterInfo.h b/Core/GameEngine/Include/Common/MapReaderWriterInfo.h
index 0d42140ef47..8d9577dcabf 100644
--- a/Core/GameEngine/Include/Common/MapReaderWriterInfo.h
+++ b/Core/GameEngine/Include/Common/MapReaderWriterInfo.h
@@ -55,6 +55,11 @@
 #define K_LIGHTING_VERSION_3	3	// Added 2 additional global lights for terrain.
 #define K_WORLDDICT_VERSION_1 1
 #define K_MAPPREVIEW_VERSION_1 1
+
+// TheSuperHackers @bugfix arcticdolphin 12/10/2026 Map size limits.
+#define MAX_MAP_DIMENSION 8192 // The shroud texture spans the map and shoreline tiles pack each coordinate into 16 bits
+#define MAX_MAP_AREA (4096*4096) // Terrain, pathfinding and partition arrays allocate per cell in a 32 bit process
+
 /** Virtual helper class, so that we can write map data using FILE* or CFile. */
 class OutputStream {
 public:
diff --git a/Core/GameEngineDevice/Include/W3DDevice/GameClient/WorldHeightMap.h b/Core/GameEngineDevice/Include/W3DDevice/GameClient/WorldHeightMap.h
index 10176bfa1aa..82422316e19 100644
--- a/Core/GameEngineDevice/Include/W3DDevice/GameClient/WorldHeightMap.h
+++ b/Core/GameEngineDevice/Include/W3DDevice/GameClient/WorldHeightMap.h
@@ -237,6 +237,7 @@ class WorldHeightMap : public RefCountClass,
 public:  // height map info.
 	static Int getMinHeightValue() {return K_MIN_HEIGHT;}
 	static Int getMaxHeightValue() {return K_MAX_HEIGHT;}
+	static Bool isValidMapSize(Int width, Int height, Int borderSize); ///< Within MAX_MAP_DIMENSION and MAX_MAP_AREA, width and height include the border
 
 	UnsignedByte *getDataPtr() {return m_data;}
 
diff --git a/Core/GameEngineDevice/Source/W3DDevice/GameClient/WorldHeightMap.cpp b/Core/GameEngineDevice/Source/W3DDevice/GameClient/WorldHeightMap.cpp
index c12e28b0db9..8465e2fc29a 100644
--- a/Core/GameEngineDevice/Source/W3DDevice/GameClient/WorldHeightMap.cpp
+++ b/Core/GameEngineDevice/Source/W3DDevice/GameClient/WorldHeightMap.cpp
@@ -827,6 +827,24 @@ Bool WorldHeightMap::ParseObjectsDataChunk(DataChunkInput &file, DataChunkInfo *
 	return (file.parse(userData));
 }
 
+Bool WorldHeightMap::isValidMapSize(Int width, Int height, Int borderSize)
+{
+	if (width <= 0 || width > MAX_MAP_DIMENSION)
+		return false;
+	if (height <= 0 || height > MAX_MAP_DIMENSION)
+		return false;
+	if (width * height > MAX_MAP_AREA)
+		return false;
+	if (borderSize < 0 || borderSize > (width - 1) / 2 || borderSize > (height - 1) / 2)
+		return false;
+	return true;
+}
+
+static Bool isValidHeightDataSize(DataChunkInput &file, Int dataSize, Int width, Int height)
+{
+	return dataSize > 0 && dataSize == width * height && (UnsignedInt)dataSize <= file.getChunkDataSizeLeft();
+}
+
 /**
 * WorldHeightMap::ParseHeightMapData - read a height map chunk.
 * Format is the newer CHUNKY format.
@@ -857,6 +875,10 @@ Bool WorldHeightMap::ParseHeightMapData(DataChunkInput &file, DataChunkInfo *inf
 		m_borderSize = 0;
 	}
 
+	if (!isValidMapSize(m_width, m_height, m_borderSize)) {
+		throw ERROR_CORRUPT_FILE_FORMAT;
+	}
+
 	if (info->version >= K_HEIGHT_MAP_VERSION_4) {
 		Int numBorders = file.readInt();
 		m_boundaries.resize(numBorders);
@@ -871,11 +893,12 @@ Bool WorldHeightMap::ParseHeightMapData(DataChunkInput &file, DataChunkInfo *inf
 	}
 
 	m_dataSize = file.readInt();
-	m_data = MSGNEW("WorldHeightMap_ParseHeightMapData") UnsignedByte[m_dataSize];
-	if (m_dataSize <= 0 || (m_dataSize != (m_width*m_height))) {
+	if (!isValidHeightDataSize(file, m_dataSize, m_width, m_height)) {
 		throw ERROR_CORRUPT_FILE_FORMAT	;
 	}
 
+	m_data = MSGNEW("WorldHeightMap_ParseHeightMapData") UnsignedByte[m_dataSize];
+
 	Int numBytesX = (m_width+7)/8;	//how many bytes to fit all bitflags
 	Int numBytesY = m_height;
 	m_seismicUpdateWidth=numBytesX;
@@ -931,6 +954,10 @@ Bool WorldHeightMap::ParseSizeOnly(DataChunkInput &file, DataChunkInfo *info, vo
 		m_borderSize = 0;
 	}
 
+	if (!isValidMapSize(m_width, m_height, m_borderSize)) {
+		throw ERROR_CORRUPT_FILE_FORMAT;
+	}
+
 	if (info->version >= K_HEIGHT_MAP_VERSION_4) {
 		Int numBorders = file.readInt();
 		m_boundaries.resize(numBorders);
@@ -945,10 +972,11 @@ Bool WorldHeightMap::ParseSizeOnly(DataChunkInput &file, DataChunkInfo *info, vo
 	}
 
 	m_dataSize = file.readInt();
-	m_data = MSGNEW("WorldHeightMap_ParseSizeOnly") UnsignedByte[m_dataSize];
-	if (m_dataSize <= 0 || (m_dataSize != (m_width*m_height))) {
+	if (!isValidHeightDataSize(file, m_dataSize, m_width, m_height)) {
 		throw ERROR_CORRUPT_FILE_FORMAT	;
 	}
+
+	m_data = MSGNEW("WorldHeightMap_ParseSizeOnly") UnsignedByte[m_dataSize];
 	file.readArrayOfBytes((char *)m_data, m_dataSize);
 	// Resize me.
 	if (info->version == K_HEIGHT_MAP_VERSION_1) {