diff --git a/extensions/qqbot/src/engine/messaging/outbound-media-send.test.ts b/extensions/qqbot/src/engine/messaging/outbound-media-send.test.ts
index a21169bc95c2..48bb08bbaaa2 100644
--- a/extensions/qqbot/src/engine/messaging/outbound-media-send.test.ts
+++ b/extensions/qqbot/src/engine/messaging/outbound-media-send.test.ts
@@ -662,4 +662,31 @@ describe("trySendViaHostRead error handling", () => {
       }),
     );
   });
+
+  it.each([
+    ["single-encoded", "%2e%2e%2f".repeat(5) + "escape.mp3"],
+    ["double-encoded", "%252e%252e%252f".repeat(5) + "escape.mp3"],
+  ])("confines %s host-read voice filenames to the staging root", async (_label, fileName) => {
+    mockedLoadOutboundMediaFromUrl.mockResolvedValue({
+      buffer: Buffer.from("audio bytes"),
+      kind: "audio",
+      fileName,
+      contentType: "audio/mpeg",
+    });
+    mockedSenderSendMedia.mockResolvedValue({ id: "voice-1", timestamp: 123 });
+
+    const result = await sendVoice(makeCtx(), "clip.mp3", [".mp3"], true);
+
+    expect(result).toMatchObject({ channel: "qqbot", messageId: "voice-1" });
+    const stagedPath = mockedSenderSendMedia.mock.calls[0]?.[0].localPathForMeta;
+    expect(stagedPath).toEqual(expect.any(String));
+    const stagedDir = path.join(openclawHome, ".openclaw", "media", "qqbot", "host-read", "voice");
+    const relativePath = path.relative(stagedDir, stagedPath as string);
+    expect(relativePath).not.toMatch(/^\.\.(?:[\\/]|$)/);
+    expect(path.isAbsolute(relativePath)).toBe(false);
+    await expect(fs.readFile(stagedPath as string)).resolves.toEqual(Buffer.from("audio bytes"));
+    await expect(fs.readdir(openclawHome)).resolves.not.toContain(
+      expect.stringMatching(/^escape-.*\.mp3$/),
+    );
+  });
 });
diff --git a/extensions/qqbot/src/engine/messaging/outbound-media-send.ts b/extensions/qqbot/src/engine/messaging/outbound-media-send.ts
index 658910a79ca0..237407aff1d1 100644
--- a/extensions/qqbot/src/engine/messaging/outbound-media-send.ts
+++ b/extensions/qqbot/src/engine/messaging/outbound-media-send.ts
@@ -3,7 +3,7 @@
  */
 
 import { randomUUID } from "node:crypto";
-import { mkdir, writeFile } from "node:fs/promises";
+import { writeFile } from "node:fs/promises";
 import path from "node:path";
 import { formatErrorMessage } from "openclaw/plugin-sdk/error-runtime";
 import { extensionForMime, type MediaKind } from "openclaw/plugin-sdk/media-mime";
@@ -11,6 +11,8 @@ import { loadOutboundMediaFromUrl } from "openclaw/plugin-sdk/outbound-media";
 import {
   pathExistsSync,
   resolveLocalPathFromRootsSync,
+  sanitizeUntrustedFileName,
+  writeExternalFileWithinRoot,
 } from "openclaw/plugin-sdk/security-runtime";
 import { truncateUtf16Safe } from "openclaw/plugin-sdk/text-utility-runtime";
 import type { GatewayAccount } from "../types.js";
@@ -252,17 +254,21 @@ async function stageLoadedHostReadVoice(
   loaded: LoadedOutboundMedia,
 ): Promise<string> {
   const stagedDir = getQQBotMediaDir("host-read", "voice");
-  await mkdir(stagedDir, { recursive: true });
-  const rawFileName = sanitizeFileName(loaded.fileName || path.basename(mediaPath) || "voice");
-  const ext = path.extname(rawFileName);
-  const inferredExt = extensionForMime(loaded.contentType);
-  const baseName = sanitizeFileName(path.basename(rawFileName, ext)) || "voice";
-  const stagedPath = path.join(
-    stagedDir,
-    `${baseName}-${randomUUID()}${ext || inferredExt || ".bin"}`,
+  // Decode QQ escapes once before applying portable basename policy. Decoding
+  // again after basename can recreate traversal separators at the write boundary.
+  const normalizedFileName = sanitizeFileName(
+    loaded.fileName || path.basename(mediaPath) || "voice",
   );
-  await writeFile(stagedPath, loaded.buffer);
-  return stagedPath;
+  const safeFileName = sanitizeUntrustedFileName(normalizedFileName, "voice");
+  const ext = path.extname(safeFileName);
+  const inferredExt = extensionForMime(loaded.contentType);
+  const baseName = path.basename(safeFileName, ext) || "voice";
+  const staged = await writeExternalFileWithinRoot({
+    rootDir: stagedDir,
+    path: `${baseName}-${randomUUID()}${ext || inferredExt || ".bin"}`,
+    write: async (tempPath) => await writeFile(tempPath, loaded.buffer),
+  });
+  return staged.path;
 }
 
 async function stageHostReadVoice(