From 00903d35310c6cdfc4f9eede5ec59b843b3ea71a Mon Sep 17 00:00:00 2001
From: 2dust <31833384+2dust@users.noreply.github.com>
Date: Fri, 19 Jun 2026 18:09:18 +0800
Subject: [PATCH] Verify if sendThrough is a local address.

https://github.com/2dust/v2rayN/issues/9562
---
 v2rayN/ServiceLib/Common/Utils.cs                    | 12 ++++++++++++
 .../Singbox/SingboxConfigTemplateService.cs          |  5 +++++
 .../CoreConfig/V2ray/V2rayConfigTemplateService.cs   |  5 +++++
 3 files changed, 22 insertions(+)

diff --git a/v2rayN/ServiceLib/Common/Utils.cs b/v2rayN/ServiceLib/Common/Utils.cs
index 87e0833d..b6831dff 100644
--- a/v2rayN/ServiceLib/Common/Utils.cs
+++ b/v2rayN/ServiceLib/Common/Utils.cs
@@ -716,6 +716,18 @@ public class Utils
         return (endpoints, connections);
     }
 
+    public static bool IsLocalIP(string ipAddress)
+    {
+        if (!IPAddress.TryParse(ipAddress, out var targetAddress))
+        {
+            return false;
+        }
+
+        return NetworkInterface.GetAllNetworkInterfaces()
+               .SelectMany(ni => ni.GetIPProperties().UnicastAddresses)
+               .Any(ua => ua.Address.Equals(targetAddress));
+    }
+
     #endregion Speed Test
 
     #region Miscellaneous
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs
index 8e573a21..171c2ecd 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs
@@ -83,6 +83,11 @@ public partial class CoreConfigSingboxService
         {
             return;
         }
+        if (!Utils.IsLocalIP(sendThrough))
+        {
+            return;
+        }
+
         foreach (var outbound in _coreConfig.outbounds ?? [])
         {
             outbound.inet4_bind_address = ShouldBindNet(outbound) ? sendThrough : null;
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs
index d7a6a9b5..6bc7079a 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs
@@ -176,6 +176,11 @@ public partial class CoreConfigV2rayService
         {
             return;
         }
+        if (!Utils.IsLocalIP(sendThrough))
+        {
+            return;
+        }
+
         foreach (var outbound in _coreConfig.outbounds ?? [])
         {
             outbound.sendThrough = ShouldBindNet(outbound) ? sendThrough : null;