fix: Validate statusCode is number and not NaN in OpenNextNodeResponse constructor

.changeset/brown-apes-kick.md

@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": patch
+---
+
+fix: Validate statusCode is number and not NaN in OpenNextNodeResponse constructor

examples/app-router/middleware.ts

@@ -28,6 +28,12 @@ export function middleware(request: NextRequest) {
     const u = new URL("https://opennext.js.org/share.png");
     return NextResponse.rewrite(u);
   }
+  if (path === "/rewrite-status-code") {
+    const u = new URL("/rewrite-destination", `${protocol}://${host}`);
+    return NextResponse.rewrite(u, {
+      status: 403,
+    });
+  }
   if (path === "/cookies") {
     const res = NextResponse.next();
     res.cookies.set("foo", "bar");

packages/open-next/src/http/openNextResponse.ts

@@ -74,7 +74,14 @@ export class OpenNextNodeResponse extends Transform implements ServerResponse {
     statusCode?: number,
   ) {
     super();
-    if (statusCode !== undefined) {
+    // We only set the status code if it is not a NaN and it is a number
+    // Only allow status codes between 100 and 599 https://httpwg.org/specs/rfc9110.html#status.codes
+    if (
+      statusCode &&
+      Number.isInteger(statusCode) &&
+      statusCode >= 100 &&
+      statusCode <= 599
+    ) {
       this.statusCode = statusCode;
     }
   }

packages/tests-e2e/tests/appRouter/middleware.rewrite.test.ts

@@ -32,3 +32,12 @@ test("Middleware Rewrite External Image", async ({ page }) => {
     expect(validateMd5(bodyBuffer, OPENNEXT_PNG_MD5)).toBe(true);
   });
 });
+
+test("Middleware Rewrite Status Code", async ({ page }) => {
+  await page.goto("/rewrite-status-code");
+  const el = page.getByText("Rewritten Destination", { exact: true });
+  await expect(el).toBeVisible();
+  page.on("response", async (response) => {
+    expect(response.status()).toBe(403);
+  });
+});