From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Telesphoreo <me@telesphoreo.me>
Date: Fri, 14 Jun 2024 18:00:35 -0500
Subject: [PATCH] Prevent attributes with invalid namespaces from being applied
 to CraftMetaItems


diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index b6cd6897844aa9c8b9a94e41c56c4cfe4ac78780..34130c2cc3f643fcfe32a02747c45dd1eba05396 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -57,6 +57,7 @@ import net.minecraft.nbt.NbtOps;
 import net.minecraft.nbt.SnbtPrinterTagVisitor;
 import net.minecraft.nbt.Tag;
 import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.Unit;
 import net.minecraft.world.entity.EquipmentSlotGroup;
@@ -764,7 +765,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
                 continue;
             }
             String attributeName = (String) obj;
-            if (Strings.isNullOrEmpty(attributeName)) {
+            if (Strings.isNullOrEmpty(attributeName) || attributeName.length() > 256 || !ResourceLocation.isValidResourceLocation(attributeName)) { // Scissors
                 continue;
             }
             List<?> list = SerializableMeta.getObject(List.class, mods, attributeName, true);