diff --git a/scripts/openclaw-cross-os-release-checks.ts b/scripts/openclaw-cross-os-release-checks.ts
index 0a8cf2bd9c2..23902047d37 100644
--- a/scripts/openclaw-cross-os-release-checks.ts
+++ b/scripts/openclaw-cross-os-release-checks.ts
@@ -2554,6 +2554,7 @@ async function configureDiscordSmoke(params) {
 export async function readBoundedCrossOsResponseText(
   response: Response,
   maxChars = CROSS_OS_FETCH_BODY_MAX_CHARS,
+  options: { signal?: AbortSignal | null } = {},
 ): Promise<string> {
   if (!response.body) {
     return "";
@@ -2563,10 +2564,11 @@ export async function readBoundedCrossOsResponseText(
   const decoder = new TextDecoder();
   let text = "";
   let truncated = false;
+  let aborted = false;
 
   try {
     while (text.length <= maxChars) {
-      const { done, value } = await reader.read();
+      const { done, value } = await readCrossOsResponseChunk(reader, options.signal);
       if (done) {
         text += decoder.decode();
         break;
@@ -2579,8 +2581,11 @@ export async function readBoundedCrossOsResponseText(
         break;
       }
     }
+  } catch (error) {
+    aborted = options.signal?.aborted === true;
+    throw error;
   } finally {
-    if (truncated) {
+    if (truncated || aborted) {
       await reader.cancel().catch(() => undefined);
     } else {
       reader.releaseLock();
@@ -2590,6 +2595,36 @@ export async function readBoundedCrossOsResponseText(
   return truncated ? `${text}\n[truncated]` : text;
 }
 
+function readCrossOsResponseChunk(
+  reader: ReadableStreamDefaultReader<Uint8Array>,
+  signal?: AbortSignal | null,
+): Promise<ReadableStreamReadResult<Uint8Array>> {
+  if (!signal) {
+    return reader.read();
+  }
+  if (signal.aborted) {
+    throw crossOsAbortReason(signal);
+  }
+  return new Promise((resolveRead, rejectRead) => {
+    const onAbort = () => rejectRead(crossOsAbortReason(signal));
+    signal.addEventListener("abort", onAbort, { once: true });
+    reader
+      .read()
+      .then(resolveRead, rejectRead)
+      .finally(() => {
+        signal.removeEventListener("abort", onAbort);
+      });
+  });
+}
+
+function crossOsAbortReason(signal: AbortSignal): Error {
+  const reason = signal.reason;
+  if (reason instanceof Error) {
+    return reason;
+  }
+  return new Error(typeof reason === "string" ? reason : "The operation was aborted.");
+}
+
 export function dashboardHtmlMarkerStatus(html: string): {
   app: boolean;
   ready: boolean;
@@ -2647,11 +2682,12 @@ async function waitForDiscordMessage(params) {
     let response;
     let text;
     try {
+      const init = buildDiscordFetchInit(params.token);
       response = await fetch(
         `https://discord.com/api/v10/channels/${params.channelId}/messages?limit=20`,
-        buildDiscordFetchInit(params.token),
+        init,
       );
-      text = await readBoundedCrossOsResponseText(response);
+      text = await readBoundedCrossOsResponseText(response, undefined, { signal: init.signal });
     } catch {
       await sleep(2_000);
       continue;
@@ -2680,20 +2716,21 @@ export function buildDiscordFetchInit(token, init = {}) {
 }
 
 async function postDiscordMessage(params) {
+  const init = buildDiscordFetchInit(params.token, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({
+      content: params.content,
+      flags: 4096,
+    }),
+  });
   const response = await fetch(
     `https://discord.com/api/v10/channels/${params.channelId}/messages`,
-    buildDiscordFetchInit(params.token, {
-      method: "POST",
-      headers: {
-        "Content-Type": "application/json",
-      },
-      body: JSON.stringify({
-        content: params.content,
-        flags: 4096,
-      }),
-    }),
+    init,
   );
-  const text = await readBoundedCrossOsResponseText(response);
+  const text = await readBoundedCrossOsResponseText(response, undefined, { signal: init.signal });
   if (!response.ok) {
     throw new Error(`Failed to post Discord smoke message: ${text}`);
   }
@@ -3525,10 +3562,11 @@ async function runDashboardSmoke(params) {
       attempt += 1;
       logStream.write(`${new Date().toISOString()} attempt=${attempt} url=${dashboardUrl}\n`);
       try {
+        const signal = AbortSignal.timeout(CROSS_OS_DASHBOARD_FETCH_TIMEOUT_MS);
         const response = await fetch(dashboardUrl, {
-          signal: AbortSignal.timeout(CROSS_OS_DASHBOARD_FETCH_TIMEOUT_MS),
+          signal,
         });
-        const html = await readBoundedCrossOsResponseText(response);
+        const html = await readBoundedCrossOsResponseText(response, undefined, { signal });
         const markers = dashboardHtmlMarkerStatus(html);
         const assetUrls = resolveDashboardAssetUrls(dashboardUrl, html);
         if (response.ok && markers.ready) {
diff --git a/test/scripts/openclaw-cross-os-release-checks.test.ts b/test/scripts/openclaw-cross-os-release-checks.test.ts
index 68635e14f30..f66486627de 100644
--- a/test/scripts/openclaw-cross-os-release-checks.test.ts
+++ b/test/scripts/openclaw-cross-os-release-checks.test.ts
@@ -166,6 +166,31 @@ describe("scripts/openclaw-cross-os-release-checks", () => {
     expect(CROSS_OS_FETCH_BODY_MAX_CHARS).toBeGreaterThan(1024);
   });
 
+  it("keeps cross-OS fetch timeouts active while reading response bodies", async () => {
+    let canceled = false;
+    const abortController = new AbortController();
+    const response = new Response(
+      new ReadableStream<Uint8Array>({
+        start(controller) {
+          controller.enqueue(new TextEncoder().encode("partial"));
+        },
+        cancel() {
+          canceled = true;
+        },
+      }),
+    );
+
+    const text = readBoundedCrossOsResponseText(response, 1024, {
+      signal: abortController.signal,
+    });
+
+    await delay(0);
+    abortController.abort(new Error("cross-os body timed out"));
+
+    await expect(text).rejects.toThrow("cross-os body timed out");
+    expect(canceled).toBe(true);
+  });
+
   it("requires dashboard root markers and same-origin asset URLs", () => {
     const html = [
       "<title>OpenClaw Control</title>",