From 76fa8a7334d93184ca97a97373e08bf56ce9a76e Mon Sep 17 00:00:00 2001
From: Kharec <sandro@cazzaniga.fr>
Date: Mon, 29 Dec 2025 15:45:52 +0100
Subject: [PATCH] fix: correct IPv6 private range checks

---
 lib/Urupam/Validation.pm | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/lib/Urupam/Validation.pm b/lib/Urupam/Validation.pm
index 34ff474..a892d55 100644
--- a/lib/Urupam/Validation.pm
+++ b/lib/Urupam/Validation.pm
@@ -117,19 +117,8 @@ sub _is_private_ipv6 {
 
     my $first = hex($first_part);
 
-    if ( $first >= 0xfc && $first <= 0xfd ) {
-        return 1;
-    }
-
-    if ( $first == 0xfe && @parts > 1 ) {
-        my $second_part = $parts[1] || '';
-        if ( length($second_part) > 0 ) {
-            my $second = hex($second_part);
-            if ( $second >= 0x80 && $second <= 0xbf ) {
-                return 1;
-            }
-        }
-    }
+    return 1 if ( $first & 0xfe00 ) == 0xfc00;
+    return 1 if ( $first & 0xffc0 ) == 0xfe80;
 
     return 0;
 }