diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8aa29c16ee..b9c5e466ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ Docs: https://docs.openclaw.ai
 - Security/Audit: distinguish external webhooks (`hooks.enabled`) from internal hooks (`hooks.internal.enabled`) in attack-surface summaries to avoid false exposure signals when only internal hooks are enabled. (#13474) Thanks @mcaxtr.
 - Security/Onboarding: clarify multi-user DM isolation remediation with explicit `openclaw config set session.dmScope ...` commands in security audit, doctor security, and channel onboarding guidance. (#13129) Thanks @VintLin.
 - Security/Audit: add misconfiguration checks for sandbox Docker config with sandbox mode off, ineffective `gateway.nodes.denyCommands` entries, global minimal tool-profile overrides by agent profiles, and permissive extension-plugin tool reachability.
+- Android/Nodes: harden `app.update` by requiring HTTPS and gateway-host URL matching plus SHA-256 verification, stream URL camera downloads to disk with size guards to avoid memory spikes, and stop signing release builds with debug keys. (#13541) Thanks @smartprogrammer93.
 - Auto-reply/Threading: auto-inject implicit reply threading so `replyToMode` works without requiring model-emitted `[[reply_to_current]]`, while preserving `replyToMode: "off"` behavior for implicit Slack replies and keeping block-streaming chunk coalescing stable under `replyToMode: "first"`. (#14976) Thanks @Diaspar4u.
 - Sandbox: pass configured `sandbox.docker.env` variables to sandbox containers at `docker create` time. (#15138) Thanks @stevebot-alive.
 - Onboarding/CLI: restore terminal state without resuming paused `stdin`, so onboarding exits cleanly after choosing Web UI and the installer returns instead of appearing stuck.
diff --git a/apps/android/app/build.gradle.kts b/apps/android/app/build.gradle.kts
index e30c1bc76b..4bd44b8efd 100644
--- a/apps/android/app/build.gradle.kts
+++ b/apps/android/app/build.gradle.kts
@@ -29,16 +29,11 @@ android {
     }
   }
 
-  signingConfigs {
-    getByName("debug")
-  }
-
   buildTypes {
     release {
       isMinifyEnabled = true
       isShrinkResources = true
       proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
-      signingConfig = signingConfigs.getByName("debug")
     }
     debug {
       isMinifyEnabled = false
diff --git a/apps/android/app/src/main/java/ai/openclaw/android/NodeRuntime.kt b/apps/android/app/src/main/java/ai/openclaw/android/NodeRuntime.kt
index c319afdbf1..51daeff5ab 100644
--- a/apps/android/app/src/main/java/ai/openclaw/android/NodeRuntime.kt
+++ b/apps/android/app/src/main/java/ai/openclaw/android/NodeRuntime.kt
@@ -91,6 +91,7 @@ class NodeRuntime(context: Context) {
   val discoveryStatusText: StateFlow<String> = discovery.statusText
 
   private val identityStore = DeviceIdentityStore(appContext)
+  private var connectedEndpoint: GatewayEndpoint? = null
 
   private val cameraHandler: CameraHandler = CameraHandler(
     appContext = appContext,
@@ -110,6 +111,7 @@ class NodeRuntime(context: Context) {
 
   private val appUpdateHandler: AppUpdateHandler = AppUpdateHandler(
     appContext = appContext,
+    connectedEndpoint = { connectedEndpoint },
   )
 
   private val locationHandler: LocationHandler = LocationHandler(
@@ -200,7 +202,6 @@ class NodeRuntime(context: Context) {
   private var nodeConnected = false
   private var operatorStatusText: String = "Offline"
   private var nodeStatusText: String = "Offline"
-  private var connectedEndpoint: GatewayEndpoint? = null
 
   private val operatorSession =
     GatewaySession(
diff --git a/apps/android/app/src/main/java/ai/openclaw/android/node/AppUpdateHandler.kt b/apps/android/app/src/main/java/ai/openclaw/android/node/AppUpdateHandler.kt
index 840c34fdf6..7472544d31 100644
--- a/apps/android/app/src/main/java/ai/openclaw/android/node/AppUpdateHandler.kt
+++ b/apps/android/app/src/main/java/ai/openclaw/android/node/AppUpdateHandler.kt
@@ -5,32 +5,107 @@ import android.content.Context
 import android.content.Intent
 import ai.openclaw.android.InstallResultReceiver
 import ai.openclaw.android.MainActivity
+import ai.openclaw.android.gateway.GatewayEndpoint
 import ai.openclaw.android.gateway.GatewaySession
+import java.io.File
+import java.net.URI
+import java.security.MessageDigest
+import java.util.Locale
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.serialization.json.buildJsonObject
-import kotlinx.serialization.json.put
 import kotlinx.coroutines.launch
 import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.buildJsonObject
 import kotlinx.serialization.json.jsonObject
 import kotlinx.serialization.json.jsonPrimitive
+import kotlinx.serialization.json.put
+
+private val SHA256_HEX = Regex("^[a-fA-F0-9]{64}$")
+
+internal data class AppUpdateRequest(
+  val url: String,
+  val expectedSha256: String,
+)
+
+internal fun parseAppUpdateRequest(paramsJson: String?, connectedHost: String?): AppUpdateRequest {
+  val params =
+    try {
+      paramsJson?.let { Json.parseToJsonElement(it).jsonObject }
+    } catch (_: Throwable) {
+      throw IllegalArgumentException("params must be valid JSON")
+    } ?: throw IllegalArgumentException("missing 'url' parameter")
+
+  val urlRaw =
+    params["url"]?.jsonPrimitive?.content?.trim().orEmpty()
+      .ifEmpty { throw IllegalArgumentException("missing 'url' parameter") }
+  val sha256Raw =
+    params["sha256"]?.jsonPrimitive?.content?.trim().orEmpty()
+      .ifEmpty { throw IllegalArgumentException("missing 'sha256' parameter") }
+  if (!SHA256_HEX.matches(sha256Raw)) {
+    throw IllegalArgumentException("invalid 'sha256' parameter (expected 64 hex chars)")
+  }
+
+  val uri =
+    try {
+      URI(urlRaw)
+    } catch (_: Throwable) {
+      throw IllegalArgumentException("invalid 'url' parameter")
+    }
+  val scheme = uri.scheme?.lowercase(Locale.US).orEmpty()
+  if (scheme != "https") {
+    throw IllegalArgumentException("url must use https")
+  }
+  if (!uri.userInfo.isNullOrBlank()) {
+    throw IllegalArgumentException("url must not include credentials")
+  }
+  val host = uri.host?.lowercase(Locale.US) ?: throw IllegalArgumentException("url host required")
+  val connectedHostNormalized = connectedHost?.trim()?.lowercase(Locale.US).orEmpty()
+  if (connectedHostNormalized.isNotEmpty() && host != connectedHostNormalized) {
+    throw IllegalArgumentException("url host must match connected gateway host")
+  }
+
+  return AppUpdateRequest(
+    url = uri.toASCIIString(),
+    expectedSha256 = sha256Raw.lowercase(Locale.US),
+  )
+}
+
+internal fun sha256Hex(file: File): String {
+  val digest = MessageDigest.getInstance("SHA-256")
+  file.inputStream().use { input ->
+    val buffer = ByteArray(DEFAULT_BUFFER_SIZE)
+    while (true) {
+      val read = input.read(buffer)
+      if (read < 0) break
+      if (read == 0) continue
+      digest.update(buffer, 0, read)
+    }
+  }
+  val out = StringBuilder(64)
+  for (byte in digest.digest()) {
+    out.append(String.format(Locale.US, "%02x", byte))
+  }
+  return out.toString()
+}
 
 class AppUpdateHandler(
   private val appContext: Context,
+  private val connectedEndpoint: () -> GatewayEndpoint?,
 ) {
 
   fun handleUpdate(paramsJson: String?): GatewaySession.InvokeResult {
     try {
-      val url = paramsJson?.let { raw ->
+      val updateRequest =
         try {
-          Json.parseToJsonElement(raw).jsonObject["url"]?.jsonPrimitive?.content
-        } catch (e: Exception) {
-          null
+          parseAppUpdateRequest(paramsJson, connectedEndpoint()?.host)
+        } catch (err: IllegalArgumentException) {
+          return GatewaySession.InvokeResult.error(
+            code = "INVALID_REQUEST",
+            message = "INVALID_REQUEST: ${err.message ?: "invalid app.update params"}",
+          )
         }
-      } ?: return GatewaySession.InvokeResult.error(
-        code = "INVALID_REQUEST",
-        message = "INVALID_REQUEST: missing 'url' parameter"
-      )
+      val url = updateRequest.url
+      val expectedSha256 = updateRequest.expectedSha256
 
       android.util.Log.w("openclaw", "app.update: downloading from $url")
 
@@ -125,6 +200,25 @@ class AppUpdateHandler(
           }
 
           android.util.Log.w("openclaw", "app.update: downloaded ${file.length()} bytes")
+          val actualSha256 = sha256Hex(file)
+          if (actualSha256 != expectedSha256) {
+            android.util.Log.e(
+              "openclaw",
+              "app.update: sha256 mismatch expected=$expectedSha256 actual=$actualSha256",
+            )
+            file.delete()
+            notifManager.cancel(notifId)
+            notifManager.notify(
+              notifId,
+              android.app.Notification.Builder(appContext, channelId)
+                .setSmallIcon(android.R.drawable.stat_notify_error)
+                .setContentTitle("Update Failed")
+                .setContentIntent(launchPi)
+                .setContentText("SHA-256 mismatch")
+                .build(),
+            )
+            return@launch
+          }
 
           // Verify file is a valid APK (basic check: ZIP magic bytes)
           val magic = file.inputStream().use { it.read().toByte() to it.read().toByte() }
@@ -189,6 +283,7 @@ class AppUpdateHandler(
       return GatewaySession.InvokeResult.ok(buildJsonObject {
           put("status", "downloading")
           put("url", url)
+          put("sha256", expectedSha256)
         }.toString())
     } catch (err: Throwable) {
       android.util.Log.e("openclaw", "app.update: error", err)
diff --git a/apps/android/app/src/test/java/ai/openclaw/android/node/AppUpdateHandlerTest.kt b/apps/android/app/src/test/java/ai/openclaw/android/node/AppUpdateHandlerTest.kt
new file mode 100644
index 0000000000..743ed92c6d
--- /dev/null
+++ b/apps/android/app/src/test/java/ai/openclaw/android/node/AppUpdateHandlerTest.kt
@@ -0,0 +1,65 @@
+package ai.openclaw.android.node
+
+import java.io.File
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
+import org.junit.Test
+
+class AppUpdateHandlerTest {
+  @Test
+  fun parseAppUpdateRequest_acceptsHttpsWithMatchingHost() {
+    val req =
+      parseAppUpdateRequest(
+        paramsJson =
+          """{"url":"https://gw.example.com/releases/openclaw.apk","sha256":"${"a".repeat(64)}"}""",
+        connectedHost = "gw.example.com",
+      )
+
+    assertEquals("https://gw.example.com/releases/openclaw.apk", req.url)
+    assertEquals("a".repeat(64), req.expectedSha256)
+  }
+
+  @Test
+  fun parseAppUpdateRequest_rejectsNonHttps() {
+    assertThrows(IllegalArgumentException::class.java) {
+      parseAppUpdateRequest(
+        paramsJson = """{"url":"http://gw.example.com/releases/openclaw.apk","sha256":"${"a".repeat(64)}"}""",
+        connectedHost = "gw.example.com",
+      )
+    }
+  }
+
+  @Test
+  fun parseAppUpdateRequest_rejectsHostMismatch() {
+    assertThrows(IllegalArgumentException::class.java) {
+      parseAppUpdateRequest(
+        paramsJson = """{"url":"https://evil.example.com/releases/openclaw.apk","sha256":"${"a".repeat(64)}"}""",
+        connectedHost = "gw.example.com",
+      )
+    }
+  }
+
+  @Test
+  fun parseAppUpdateRequest_rejectsInvalidSha256() {
+    assertThrows(IllegalArgumentException::class.java) {
+      parseAppUpdateRequest(
+        paramsJson = """{"url":"https://gw.example.com/releases/openclaw.apk","sha256":"bad"}""",
+        connectedHost = "gw.example.com",
+      )
+    }
+  }
+
+  @Test
+  fun sha256Hex_computesExpectedDigest() {
+    val tmp = File.createTempFile("openclaw-update-hash", ".bin")
+    try {
+      tmp.writeText("hello", Charsets.UTF_8)
+      assertEquals(
+        "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
+        sha256Hex(tmp),
+      )
+    } finally {
+      tmp.delete()
+    }
+  }
+}
diff --git a/src/cli/nodes-camera.test.ts b/src/cli/nodes-camera.test.ts
index c3ef541122..63e1b1a4da 100644
--- a/src/cli/nodes-camera.test.ts
+++ b/src/cli/nodes-camera.test.ts
@@ -1,12 +1,13 @@
 import * as fs from "node:fs/promises";
 import * as os from "node:os";
 import * as path from "node:path";
-import { describe, expect, it } from "vitest";
+import { afterEach, describe, expect, it, vi } from "vitest";
 import {
   cameraTempPath,
   parseCameraClipPayload,
   parseCameraSnapPayload,
   writeBase64ToFile,
+  writeUrlToFile,
 } from "./nodes-camera.js";
 
 describe("nodes camera helpers", () => {
@@ -61,4 +62,45 @@ describe("nodes camera helpers", () => {
     await expect(fs.readFile(out, "utf8")).resolves.toBe("hi");
     await fs.rm(dir, { recursive: true, force: true });
   });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it("writes url payload to file", async () => {
+    vi.stubGlobal(
+      "fetch",
+      vi.fn(async () => new Response("url-content", { status: 200 })),
+    );
+    const dir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-test-"));
+    const out = path.join(dir, "x.bin");
+    try {
+      await writeUrlToFile(out, "https://example.com/clip.mp4");
+      await expect(fs.readFile(out, "utf8")).resolves.toBe("url-content");
+    } finally {
+      await fs.rm(dir, { recursive: true, force: true });
+    }
+  });
+
+  it("rejects non-https url payload", async () => {
+    await expect(writeUrlToFile("/tmp/ignored", "http://example.com/x.bin")).rejects.toThrow(
+      /only https/i,
+    );
+  });
+
+  it("rejects oversized content-length for url payload", async () => {
+    vi.stubGlobal(
+      "fetch",
+      vi.fn(
+        async () =>
+          new Response("tiny", {
+            status: 200,
+            headers: { "content-length": String(999_999_999) },
+          }),
+      ),
+    );
+    await expect(writeUrlToFile("/tmp/ignored", "https://example.com/huge.bin")).rejects.toThrow(
+      /exceeds max/i,
+    );
+  });
 });
diff --git a/src/cli/nodes-camera.ts b/src/cli/nodes-camera.ts
index cf1cc41c70..ef06623a77 100644
--- a/src/cli/nodes-camera.ts
+++ b/src/cli/nodes-camera.ts
@@ -4,6 +4,8 @@ import * as os from "node:os";
 import * as path from "node:path";
 import { resolveCliName } from "./cli-name.js";
 
+const MAX_CAMERA_URL_DOWNLOAD_BYTES = 250 * 1024 * 1024;
+
 export type CameraFacing = "front" | "back";
 
 export type CameraSnapPayload = {
@@ -84,13 +86,62 @@ export async function writeUrlToFile(filePath: string, url: string) {
   if (parsed.protocol !== "https:") {
     throw new Error(`writeUrlToFile: only https URLs are allowed, got ${parsed.protocol}`);
   }
+
   const res = await fetch(url);
   if (!res.ok) {
     throw new Error(`failed to download ${url}: ${res.status} ${res.statusText}`);
   }
-  const buf = Buffer.from(await res.arrayBuffer());
-  await fs.writeFile(filePath, buf);
-  return { path: filePath, bytes: buf.length };
+
+  const contentLengthRaw = res.headers.get("content-length");
+  const contentLength = contentLengthRaw ? Number.parseInt(contentLengthRaw, 10) : undefined;
+  if (
+    typeof contentLength === "number" &&
+    Number.isFinite(contentLength) &&
+    contentLength > MAX_CAMERA_URL_DOWNLOAD_BYTES
+  ) {
+    throw new Error(
+      `writeUrlToFile: content-length ${contentLength} exceeds max ${MAX_CAMERA_URL_DOWNLOAD_BYTES}`,
+    );
+  }
+
+  const body = res.body;
+  if (!body) {
+    throw new Error(`failed to download ${url}: empty response body`);
+  }
+
+  const fileHandle = await fs.open(filePath, "w");
+  let bytes = 0;
+  let thrown: unknown;
+  try {
+    const reader = body.getReader();
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) {
+        break;
+      }
+      if (!value || value.byteLength === 0) {
+        continue;
+      }
+      bytes += value.byteLength;
+      if (bytes > MAX_CAMERA_URL_DOWNLOAD_BYTES) {
+        throw new Error(
+          `writeUrlToFile: downloaded ${bytes} bytes, exceeds max ${MAX_CAMERA_URL_DOWNLOAD_BYTES}`,
+        );
+      }
+      await fileHandle.write(value);
+    }
+  } catch (err) {
+    thrown = err;
+  } finally {
+    await fileHandle.close();
+  }
+
+  if (thrown) {
+    await fs.unlink(filePath).catch(() => {});
+    throw thrown;
+  }
+
+  return { path: filePath, bytes };
 }
 
 export async function writeBase64ToFile(filePath: string, base64: string) {
diff --git a/src/cli/program.nodes-media.e2e.test.ts b/src/cli/program.nodes-media.e2e.test.ts
index ade91084dd..563b6c8296 100644
--- a/src/cli/program.nodes-media.e2e.test.ts
+++ b/src/cli/program.nodes-media.e2e.test.ts
@@ -468,12 +468,13 @@ describe("cli program (nodes media)", () => {
 
     beforeAll(() => {
       originalFetch = globalThis.fetch;
-      globalThis.fetch = vi.fn(async () => ({
-        ok: true,
-        status: 200,
-        statusText: "OK",
-        arrayBuffer: async () => new TextEncoder().encode("url-content").buffer,
-      })) as unknown as typeof globalThis.fetch;
+      globalThis.fetch = vi.fn(
+        async () =>
+          new Response("url-content", {
+            status: 200,
+            headers: { "content-length": String("11") },
+          }),
+      ) as unknown as typeof globalThis.fetch;
     });
 
     afterAll(() => {