From a21e6dbccd302bdda24de391d4a201d0a93483ea Mon Sep 17 00:00:00 2001
From: Sebastian Markbage <sebastian@calyptus.eu>
Date: Thu, 11 Dec 2025 17:20:53 -0500
Subject: [PATCH] Add extra protection

---
 packages/react-server/src/ReactFlightReplyServer.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/react-server/src/ReactFlightReplyServer.js b/packages/react-server/src/ReactFlightReplyServer.js
index 1831a358576..4d5a6da8b8e 100644
--- a/packages/react-server/src/ReactFlightReplyServer.js
+++ b/packages/react-server/src/ReactFlightReplyServer.js
@@ -132,8 +132,10 @@ ReactPromise.prototype.then = function <T>(
         let inspectedValue = chunk.value;
         // Recursively check if the value is itself a ReactPromise and if so if it points
         // back to itself. This helps catch recursive thenables early error.
+        let cycleProtection = 0;
         while (inspectedValue instanceof ReactPromise) {
-          if (inspectedValue === chunk) {
+          cycleProtection++;
+          if (inspectedValue === chunk || cycleProtection > 1000) {
             if (typeof reject === 'function') {
               reject(new Error('Cannot have cyclic thenables.'));
             }