From 0cda0689184277c7e58ec021ab062c5a3e1d589b Mon Sep 17 00:00:00 2001
From: Joshua Rogers <MegaManSec@users.noreply.github.com>
Date: Sat, 10 Jan 2026 03:20:59 +1100
Subject: [PATCH] Fix thread-unsafe ActivityPub activity dispatch (#37423)

---
 app/lib/activitypub/activity.rb | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/app/lib/activitypub/activity.rb b/app/lib/activitypub/activity.rb
index 64ee9acd0..d07d1c2f2 100644
--- a/app/lib/activitypub/activity.rb
+++ b/app/lib/activitypub/activity.rb
@@ -21,14 +21,13 @@ class ActivityPub::Activity
 
   class << self
     def factory(json, account, **)
-      @json = json
-      klass&.new(json, account, **)
+      klass_for(json)&.new(json, account, **)
     end
 
     private
 
-    def klass
-      case @json['type']
+    def klass_for(json)
+      case json['type']
       when 'Create'
         ActivityPub::Activity::Create
       when 'Announce'