From 11266c2bf5331e2cb220156adf201674b45b510b Mon Sep 17 00:00:00 2001
From: Archkon <180910180+Archkon@users.noreply.github.com>
Date: Sat, 1 Aug 2026 18:39:31 +0800
Subject: [PATCH] src: match cmd.exe case-insensitively in task runner

Use a case-insensitive suffix comparison for ComSpec so uppercase and
mixed-case CMD.EXE paths use the correct /c invocation.

Signed-off-by: Archkon <180910180+Archkon@users.noreply.github.com>
---
 src/node_task_runner.cc        |  6 +++++-
 test/parallel/test-node-run.js | 22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/node_task_runner.cc b/src/node_task_runner.cc
index 22c02e83e12e..edd3d3625e4c 100644
--- a/src/node_task_runner.cc
+++ b/src/node_task_runner.cc
@@ -60,7 +60,11 @@ ProcessRunner::ProcessRunner(std::shared_ptr<InitializationResultImpl> result,
   }
 
 #ifdef _WIN32
-  if (file_.ends_with("cmd.exe")) {
+  static constexpr std::string_view cmd_exe = "cmd.exe";
+  if (file_.size() >= cmd_exe.size() &&
+      StringEqualNoCaseN(file_.data() + file_.size() - cmd_exe.size(),
+                         cmd_exe.data(),
+                         cmd_exe.size())) {
     // If the file is cmd.exe, use the following command line arguments:
     // "/c" Carries out the command and exit.
     // "/d" Disables execution of AutoRun commands.
diff --git a/test/parallel/test-node-run.js b/test/parallel/test-node-run.js
index e24117f6b165..6b72da7f2e4f 100644
--- a/test/parallel/test-node-run.js
+++ b/test/parallel/test-node-run.js
@@ -34,6 +34,28 @@ describe('node --run [command]', () => {
     assert.strictEqual(child.code, 1);
   });
 
+  it('recognizes cmd.exe case-insensitively', {
+    skip: !common.isWindows,
+  }, async () => {
+    const env = { ...process.env };
+    const comspecKey = Object.keys(env)
+      .find((key) => key.toLowerCase() === 'comspec');
+    assert.notStrictEqual(comspecKey, undefined);
+    const comspec = env[comspecKey];
+    assert.match(comspec, /cmd\.exe$/i);
+    delete env[comspecKey];
+    env.ComSpec = comspec.replace(/cmd\.exe$/i, 'CMD.EXE');
+
+    const child = await common.spawnPromisified(
+      process.execPath,
+      [ '--run', 'pwd-windows'],
+      { cwd: fixtures.path('run-script'), env },
+    );
+    assert.strictEqual(child.stdout.trim(), fixtures.path('run-script'));
+    assert.strictEqual(child.stderr, '');
+    assert.strictEqual(child.code, 0);
+  });
+
   it('adds node_modules/.bin to path', async () => {
     const child = await common.spawnPromisified(
       process.execPath,