diff -rupN yarn-1.22.21/node_modules/tough-cookie/lib/memstore.js yarn-1.22.21-new/node_modules/tough-cookie/lib/memstore.js
--- yarn-1.22.21/node_modules/tough-cookie/lib/memstore.js	2024-02-16 23:36:08.000000000 +0100
+++ yarn-1.22.21-new/node_modules/tough-cookie/lib/memstore.js	2024-02-19 10:48:11.215668646 +0100
@@ -36,7 +36,7 @@ var util = require('util');
 
 function MemoryCookieStore() {
   Store.call(this);
-  this.idx = {};
+  this.idx = Object.create(null);
 }
 util.inherits(MemoryCookieStore, Store);
 exports.MemoryCookieStore = MemoryCookieStore;
@@ -115,10 +115,10 @@ MemoryCookieStore.prototype.findCookies
 
 MemoryCookieStore.prototype.putCookie = function(cookie, cb) {
   if (!this.idx[cookie.domain]) {
-    this.idx[cookie.domain] = {};
+    this.idx[cookie.domain] = Object.create(null);
   }
   if (!this.idx[cookie.domain][cookie.path]) {
-    this.idx[cookie.domain][cookie.path] = {};
+    this.idx[cookie.domain][cookie.path] = Object.create(null);
   }
   this.idx[cookie.domain][cookie.path][cookie.key] = cookie;
   cb(null);