From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Video <videogamesm12@gmail.com>
Date: Wed, 30 Mar 2022 18:20:09 -0600
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 d8eb84f28761dce95330afc32e4c011a4ab89b18..d48005ae6a19e05a37172dc5af595492a0ca2ede 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -46,6 +46,7 @@ import net.minecraft.nbt.NbtIo;
 import net.minecraft.nbt.StringTag;
 import net.minecraft.nbt.Tag;
 import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.BlockItem;
 import org.apache.commons.lang.Validate;
 import org.apache.commons.lang3.EnumUtils;
@@ -481,7 +482,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
             AttributeModifier attribMod = CraftAttributeInstance.convert(nmsModifier);
 
             String attributeName = CraftAttributeMap.convertIfNeeded(entry.getString(ATTRIBUTES_IDENTIFIER.NBT)); // Paper
-            if (attributeName == null || attributeName.isEmpty()) {
+            if (attributeName == null || attributeName.isEmpty() || attributeName.length() > 256 || !ResourceLocation.isValidResourceLocation(attributeName)) { // Scissors
                 continue;
             }