From 694b4fd5b8ed7728b840061b1ca664438ccc08f3 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Fri, 15 Oct 2021 18:00:52 +0200
Subject: [PATCH] [Uid] fix 4 missing bits of entropy in UUIDv4

---
 src/Symfony/Component/Uid/UuidV4.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Uid/UuidV4.php b/src/Symfony/Component/Uid/UuidV4.php
index 53428eeb5bf64..897e1ba627213 100644
--- a/src/Symfony/Component/Uid/UuidV4.php
+++ b/src/Symfony/Component/Uid/UuidV4.php
@@ -24,7 +24,7 @@ public function __construct(string $uuid = null)
     {
         if (null === $uuid) {
             $uuid = random_bytes(16);
-            $uuid[6] = $uuid[6] & "\x0F" | "\x4F";
+            $uuid[6] = $uuid[6] & "\x0F" | "\x40";
             $uuid[8] = $uuid[8] & "\x3F" | "\x80";
             $uuid = bin2hex($uuid);