--- a/net/minecraft/network/codec/ByteBufCodecs.java
+++ b/net/minecraft/network/codec/ByteBufCodecs.java
@@ -389,6 +_,48 @@
         };
     }
 
+    // Paper start - Track codec depth
+    static <B extends FriendlyByteBuf, V> StreamCodec<B, V> trackDepth(final StreamCodec<B, V> codec) {
+        return new StreamCodec<>() {
+            @Override
+            public V decode(B buffer) {
+                buffer.trackCodecDepth = true;
+                try {
+                    return codec.decode(buffer);
+                } finally {
+                    buffer.trackCodecDepth = false;
+                    buffer.codecDepth = 0;
+                }
+            }
+
+            @Override
+            public void encode(B buffer, V value) {
+                codec.encode(buffer, value);
+            }
+        };
+    }
+
+    static <B extends FriendlyByteBuf, V> StreamCodec<B, V> increaseDepth(final StreamCodec<B, V> codec) {
+        return new StreamCodec<>() {
+            @Override
+            public V decode(B buffer) {
+                if (!buffer.trackCodecDepth) {
+                    return codec.decode(buffer);
+                }
+                if (++buffer.codecDepth > 64) {
+                    throw new DecoderException("Too deep");
+                }
+                return codec.decode(buffer);
+            }
+
+            @Override
+            public void encode(B buffer, V value) {
+                codec.encode(buffer, value);
+            }
+        };
+    }
+    // Paper end - Track codec depth
+
     static <B extends ByteBuf, V> StreamCodec<B, Optional<V>> optional(final StreamCodec<B, V> codec) {
         return new StreamCodec<B, Optional<V>>() {
             @Override