path: fix normalization of Windows device paths missing colon

lib/path.js

@@ -402,11 +402,22 @@ const win32 = {
                 device = `\\\\${firstPart}`;
                 rootEnd = 4;
                 const colonIndex = StringPrototypeIndexOf(path, ':');
-                // Special case: handle \\?\COM1: or similar reserved device paths
-                const possibleDevice = StringPrototypeSlice(path, 4, colonIndex + 1);
-                if (isWindowsReservedName(possibleDevice, possibleDevice.length - 1)) {
-                  device = `\\\\?\\${possibleDevice}`;
-                  rootEnd = 4 + possibleDevice.length;
+
+                if (colonIndex !== -1) {
+                  // Handle \\?\COM1: or similar reserved device paths with colon
+                  const possibleDevice = StringPrototypeSlice(path, 4, colonIndex + 1);
+                  if (isWindowsReservedName(possibleDevice, possibleDevice.length - 1)) {
+                    device = `\\\\?\\${possibleDevice}`;
+                    rootEnd = 4 + possibleDevice.length;
+                  }
+                } else {
+                  // Handle \\.\CON or \\?\CON where the colon is missing
+                  const possibleDevice = StringPrototypeSlice(path, 4);
+                  const upper = StringPrototypeToUpperCase(possibleDevice);
+                  if (ArrayPrototypeIncludes(WINDOWS_RESERVED_NAMES, upper)) {
+                    device = `\\\\.\\${possibleDevice}`;
+                    rootEnd = 4 + possibleDevice.length;
+                  }
                 }
               } else if (j === len) {
                 // We matched a UNC root only

test/parallel/test-path-win32-normalize-device-missing-colon.js

@@ -0,0 +1,27 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const path = require('path');
+
+// هذا السطر يمنع تشغيل الاختبار على غير ويندوز لأنه خاص بويندوز فقط
+if (!common.isWindows)
+  common.skip('this test is for win32 only');
+
+// Test cases for reserved device names missing the trailing colon
+// See: https://github.com/nodejs/node/pull/[YOUR_PR_NUMBER] (optional)
+
+// 1. Check \\.\CON (Missing colon)
+assert.strictEqual(path.win32.normalize('\\\\.\\CON'), '\\\\.\\CON');
+assert.strictEqual(path.win32.normalize('\\\\.\\con'), '\\\\.\\con'); // Case insensitive
+
+// 2. Check \\?\CON (Missing colon)
+assert.strictEqual(path.win32.normalize('\\\\?\\CON'), '\\\\?\\CON');
+assert.strictEqual(path.win32.normalize('\\\\?\\con'), '\\\\?\\con');
+
+// 3. Check that regular files are NOT affected (Sanity check)
+assert.strictEqual(path.win32.normalize('\\\\.\\PhysicalDrive0'), '\\\\.\\PhysicalDrive0');
+
+// 4. Check join behavior (to ensure it acts as a root)
+// If it's a root, joining '..' should not strip the device.
+const joined = path.win32.join('\\\\.\\CON', '..');
+assert.strictEqual(joined, '\\\\.\\CON');