OpenClaw < 2026.2.19 - Path Traversal in Feishu Media Temporary File Naming

@@ -7,11 +7,14 @@ import {
   DEFAULT_GROUP_HISTORY_LIMIT,
   type HistoryEntry,
 } from "openclaw/plugin-sdk";
+import type { FeishuMessageContext, FeishuMediaInfo, ResolvedFeishuAccount } from "./types.js";
+import type { DynamicAgentCreationConfig } from "./types.js";
 import { resolveFeishuAccount } from "./accounts.js";
 import { createFeishuClient } from "./client.js";
 import { tryRecordMessage } from "./dedup.js";
 import { maybeCreateDynamicAgent } from "./dynamic-agent.js";
-import { downloadImageFeishu, downloadMessageResourceFeishu } from "./media.js";
+import { normalizeFeishuExternalKey } from "./external-keys.js";
+import { downloadMessageResourceFeishu } from "./media.js";
 import { extractMentionTargets, extractMessageBody, isMentionForwardRequest } from "./mention.js";
 import {
   resolveFeishuGroupConfig,
@@ -22,8 +25,6 @@ import {
 import { createFeishuReplyDispatcher } from "./reply-dispatcher.js";
 import { getFeishuRuntime } from "./runtime.js";
 import { getMessageFeishu, sendMessageFeishu } from "./send.js";
-import type { FeishuMessageContext, FeishuMediaInfo, ResolvedFeishuAccount } from "./types.js";
-import type { DynamicAgentCreationConfig } from "./types.js";
 
 // --- Permission error extraction ---
 // Extract permission grant URL from Feishu API error response.
@@ -224,18 +225,20 @@ function parseMediaKeys(
 } {
   try {
     const parsed = JSON.parse(content);
+    const imageKey = normalizeFeishuExternalKey(parsed.image_key);
+    const fileKey = normalizeFeishuExternalKey(parsed.file_key);
     switch (messageType) {
       case "image":
-        return { imageKey: parsed.image_key };
+        return { imageKey };
       case "file":
-        return { fileKey: parsed.file_key, fileName: parsed.file_name };
+        return { fileKey, fileName: parsed.file_name };
       case "audio":
-        return { fileKey: parsed.file_key };
+        return { fileKey };
       case "video":
         // Video has both file_key (video) and image_key (thumbnail)
-        return { fileKey: parsed.file_key, imageKey: parsed.image_key };
+        return { fileKey, imageKey };
       case "sticker":
-        return { fileKey: parsed.file_key };
+        return { fileKey };
       default:
         return {};
     }
@@ -277,7 +280,10 @@ function parsePostContent(content: string): {
             }
           } else if (element.tag === "img" && element.image_key) {
             // Embedded image
-            imageKeys.push(element.image_key);
+            const imageKey = normalizeFeishuExternalKey(element.image_key);
+            if (imageKey) {
+              imageKeys.push(imageKey);
+            }
           }
         }
         textContent += "\n";

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+import { normalizeFeishuExternalKey } from "./external-keys.js";
+
+describe("normalizeFeishuExternalKey", () => {
+  it("accepts a normal feishu key and trims surrounding spaces", () => {
+    expect(normalizeFeishuExternalKey("  img_v3_01abcDEF123  ")).toBe("img_v3_01abcDEF123");
+  });
+
+  it("rejects traversal and path separator patterns", () => {
+    expect(normalizeFeishuExternalKey("../etc/passwd")).toBeUndefined();
+    expect(normalizeFeishuExternalKey("a/../../b")).toBeUndefined();
+    expect(normalizeFeishuExternalKey("a\\..\\b")).toBeUndefined();
+  });
+
+  it("rejects empty, non-string, and control-char values", () => {
+    expect(normalizeFeishuExternalKey("   ")).toBeUndefined();
+    expect(normalizeFeishuExternalKey(123)).toBeUndefined();
+    expect(normalizeFeishuExternalKey("abc\u0000def")).toBeUndefined();
+  });
+});

@@ -0,0 +1,19 @@
+const CONTROL_CHARS_RE = /[\u0000-\u001f\u007f]/;
+const MAX_EXTERNAL_KEY_LENGTH = 512;
+
+export function normalizeFeishuExternalKey(value: unknown): string | undefined {
+  if (typeof value !== "string") {
+    return undefined;
+  }
+  const normalized = value.trim();
+  if (!normalized || normalized.length > MAX_EXTERNAL_KEY_LENGTH) {
+    return undefined;
+  }
+  if (CONTROL_CHARS_RE.test(normalized)) {
+    return undefined;
+  }
+  if (normalized.includes("/") || normalized.includes("\\") || normalized.includes("..")) {
+    return undefined;
+  }
+  return normalized;
+}

@@ -199,8 +199,8 @@ describe("sendMediaFeishu msg_type routing", () => {
     expect(messageReplyMock).not.toHaveBeenCalled();
   });
 
-  it("does not include imageKey path segments in temp file path", async () => {
-    const maliciousImageKey = "a/../../../../pwned.txt";
+  it("uses isolated temp paths for image downloads", async () => {
+    const imageKey = "img_v3_01abc123";
     let capturedPath: string | undefined;
 
     imageGetMock.mockResolvedValueOnce({
@@ -212,12 +212,12 @@ describe("sendMediaFeishu msg_type routing", () => {
 
     const result = await downloadImageFeishu({
       cfg: {} as any,
-      imageKey: maliciousImageKey,
+      imageKey,
     });
 
     expect(result.buffer).toEqual(Buffer.from("image-data"));
     expect(capturedPath).toBeDefined();
-    expect(capturedPath).not.toContain(maliciousImageKey);
+    expect(capturedPath).not.toContain(imageKey);
     expect(capturedPath).not.toContain("..");
 
     const tmpRoot = path.resolve(os.tmpdir());
@@ -226,8 +226,8 @@ describe("sendMediaFeishu msg_type routing", () => {
     expect(rel === ".." || rel.startsWith(`..${path.sep}`)).toBe(false);
   });
 
-  it("does not include fileKey path segments in temp file path", async () => {
-    const maliciousFileKey = "x/../../../../../etc/hosts";
+  it("uses isolated temp paths for message resource downloads", async () => {
+    const fileKey = "file_v3_01abc123";
     let capturedPath: string | undefined;
 
     messageResourceGetMock.mockResolvedValueOnce({
@@ -240,18 +240,42 @@ describe("sendMediaFeishu msg_type routing", () => {
     const result = await downloadMessageResourceFeishu({
       cfg: {} as any,
       messageId: "om_123",
-      fileKey: maliciousFileKey,
+      fileKey,
       type: "image",
     });
 
     expect(result.buffer).toEqual(Buffer.from("resource-data"));
     expect(capturedPath).toBeDefined();
-    expect(capturedPath).not.toContain(maliciousFileKey);
+    expect(capturedPath).not.toContain(fileKey);
     expect(capturedPath).not.toContain("..");
 
     const tmpRoot = path.resolve(os.tmpdir());
     const resolved = path.resolve(capturedPath as string);
     const rel = path.relative(tmpRoot, resolved);
     expect(rel === ".." || rel.startsWith(`..${path.sep}`)).toBe(false);
   });
+
+  it("rejects invalid image keys before calling feishu api", async () => {
+    await expect(
+      downloadImageFeishu({
+        cfg: {} as any,
+        imageKey: "a/../../bad",
+      }),
+    ).rejects.toThrow("invalid image_key");
+
+    expect(imageGetMock).not.toHaveBeenCalled();
+  });
+
+  it("rejects invalid file keys before calling feishu api", async () => {
+    await expect(
+      downloadMessageResourceFeishu({
+        cfg: {} as any,
+        messageId: "om_123",
+        fileKey: "x/../../bad",
+        type: "file",
+      }),
+    ).rejects.toThrow("invalid file_key");
+
+    expect(messageResourceGetMock).not.toHaveBeenCalled();
+  });
 });

@@ -1,10 +1,10 @@
 import fs from "fs";
-import os from "os";
+import { withTempDownloadPath, type ClawdbotConfig } from "openclaw/plugin-sdk";
 import path from "path";
 import { Readable } from "stream";
-import type { ClawdbotConfig } from "openclaw/plugin-sdk";
 import { resolveFeishuAccount } from "./accounts.js";
 import { createFeishuClient } from "./client.js";
+import { normalizeFeishuExternalKey } from "./external-keys.js";
 import { getFeishuRuntime } from "./runtime.js";
 import { assertFeishuMessageApiSuccess, toFeishuSendResult } from "./send-result.js";
 import { resolveReceiveIdType, normalizeFeishuTarget } from "./targets.js";
@@ -20,19 +20,6 @@ export type DownloadMessageResourceResult = {
   fileName?: string;
 };
 
-async function withTempDownloadPath<T>(
-  prefix: string,
-  fn: (tmpPath: string) => Promise<T>,
-): Promise<T> {
-  const dir = await fs.promises.mkdtemp(path.join(os.tmpdir(), prefix));
-  const tmpPath = path.join(dir, "download.bin");
-  try {
-    return await fn(tmpPath);
-  } finally {
-    await fs.promises.rm(dir, { recursive: true, force: true }).catch(() => {});
-  }
-}
-
 async function readFeishuResponseBuffer(params: {
   response: unknown;
   tmpDirPrefix: string;
@@ -66,7 +53,7 @@ async function readFeishuResponseBuffer(params: {
     return Buffer.concat(chunks);
   }
   if (typeof responseAny.writeFile === "function") {
-    return await withTempDownloadPath(params.tmpDirPrefix, async (tmpPath) => {
+    return await withTempDownloadPath({ prefix: params.tmpDirPrefix }, async (tmpPath) => {
       await responseAny.writeFile(tmpPath);
       return await fs.promises.readFile(tmpPath);
     });
@@ -101,6 +88,10 @@ export async function downloadImageFeishu(params: {
   accountId?: string;
 }): Promise<DownloadImageResult> {
   const { cfg, imageKey, accountId } = params;
+  const normalizedImageKey = normalizeFeishuExternalKey(imageKey);
+  if (!normalizedImageKey) {
+    throw new Error("Feishu image download failed: invalid image_key");
+  }
   const account = resolveFeishuAccount({ cfg, accountId });
   if (!account.configured) {
     throw new Error(`Feishu account "${account.accountId}" not configured`);
@@ -109,7 +100,7 @@ export async function downloadImageFeishu(params: {
   const client = createFeishuClient(account);
 
   const response = await client.im.image.get({
-    path: { image_key: imageKey },
+    path: { image_key: normalizedImageKey },
   });
 
   const buffer = await readFeishuResponseBuffer({
@@ -132,6 +123,10 @@ export async function downloadMessageResourceFeishu(params: {
   accountId?: string;
 }): Promise<DownloadMessageResourceResult> {
   const { cfg, messageId, fileKey, type, accountId } = params;
+  const normalizedFileKey = normalizeFeishuExternalKey(fileKey);
+  if (!normalizedFileKey) {
+    throw new Error("Feishu message resource download failed: invalid file_key");
+  }
   const account = resolveFeishuAccount({ cfg, accountId });
   if (!account.configured) {
     throw new Error(`Feishu account "${account.accountId}" not configured`);
@@ -140,7 +135,7 @@ export async function downloadMessageResourceFeishu(params: {
   const client = createFeishuClient(account);
 
   const response = await client.im.messageResource.get({
-    path: { message_id: messageId, file_key: fileKey },
+    path: { message_id: messageId, file_key: normalizedFileKey },
     params: { type },
   });
 

@@ -1,17 +1,16 @@
-import crypto from "node:crypto";
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 import type { MsgContext } from "../auto-reply/templating.js";
 import type { MediaUnderstandingAttachmentsConfig } from "../config/types.tools.js";
+import type { MediaAttachment, MediaUnderstandingCapability } from "./types.js";
 import { logVerbose, shouldLogVerbose } from "../globals.js";
 import { isAbortError } from "../infra/unhandled-rejections.js";
 import { fetchRemoteMedia, MediaFetchError } from "../media/fetch.js";
 import { detectMime, getFileExtension, isAudioFileName, kindFromMime } from "../media/mime.js";
+import { buildRandomTempFilePath } from "../plugin-sdk/temp-path.js";
 import { MediaUnderstandingSkipError } from "./errors.js";
 import { fetchWithTimeout } from "./providers/shared.js";
-import type { MediaAttachment, MediaUnderstandingCapability } from "./types.js";
 
 type MediaBufferResult = {
   buffer: Buffer;
@@ -352,7 +351,10 @@ export class MediaAttachmentCache {
       timeoutMs: params.timeoutMs,
     });
     const extension = path.extname(bufferResult.fileName || "") || "";
-    const tmpPath = path.join(os.tmpdir(), `openclaw-media-${crypto.randomUUID()}${extension}`);
+    const tmpPath = buildRandomTempFilePath({
+      prefix: "openclaw-media",
+      extension,
+    });
     await fs.writeFile(tmpPath, bufferResult.buffer);
     entry.tempPath = tmpPath;
     entry.tempCleanup = async () => {

@@ -154,7 +154,7 @@ export { extractToolSend } from "./tool-send.js";
 export { resolveChannelAccountConfigBasePath } from "./config-paths.js";
 export { chunkTextForOutbound } from "./text-chunking.js";
 export { readJsonFileWithFallback, writeJsonFileAtomically } from "./json-store.js";
-export { buildRandomTempFilePath } from "./temp-path.js";
+export { buildRandomTempFilePath, withTempDownloadPath } from "./temp-path.js";
 export type { ChatType } from "../channels/chat-type.js";
 /** @deprecated Use ChatType instead */
 export type { RoutePeerKind } from "../routing/resolve-route.js";

@@ -1,7 +1,8 @@
+import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 import { describe, expect, it } from "vitest";
-import { buildRandomTempFilePath } from "./temp-path.js";
+import { buildRandomTempFilePath, withTempDownloadPath } from "./temp-path.js";
 
 describe("buildRandomTempFilePath", () => {
   it("builds deterministic paths when now/uuid are provided", () => {
@@ -30,3 +31,41 @@ describe("buildRandomTempFilePath", () => {
     expect(result).not.toContain("..");
   });
 });
+
+describe("withTempDownloadPath", () => {
+  it("creates a temp path under tmp dir and cleans up the temp directory", async () => {
+    let capturedPath = "";
+    await withTempDownloadPath(
+      {
+        prefix: "line-media",
+      },
+      async (tmpPath) => {
+        capturedPath = tmpPath;
+        await fs.writeFile(tmpPath, "ok");
+      },
+    );
+
+    expect(capturedPath).toContain(path.join(os.tmpdir(), "line-media-"));
+    await expect(fs.stat(capturedPath)).rejects.toMatchObject({ code: "ENOENT" });
+  });
+
+  it("sanitizes prefix and fileName", async () => {
+    let capturedPath = "";
+    await withTempDownloadPath(
+      {
+        prefix: "../../line/../media",
+        fileName: "../../evil.bin",
+      },
+      async (tmpPath) => {
+        capturedPath = tmpPath;
+      },
+    );
+
+    const tmpRoot = path.resolve(os.tmpdir());
+    const resolved = path.resolve(capturedPath);
+    const rel = path.relative(tmpRoot, resolved);
+    expect(rel === ".." || rel.startsWith(`..${path.sep}`)).toBe(false);
+    expect(path.basename(capturedPath)).toBe("evil.bin");
+    expect(capturedPath).not.toContain("..");
+  });
+});

@@ -1,4 +1,5 @@
 import crypto from "node:crypto";
+import { mkdtemp, rm } from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 
@@ -20,6 +21,12 @@ function sanitizeExtension(extension?: string): string {
   return `.${token}`;
 }
 
+function sanitizeFileName(fileName: string): string {
+  const base = path.basename(fileName).replace(/[^a-zA-Z0-9._-]+/g, "-");
+  const normalized = base.replace(/^-+|-+$/g, "");
+  return normalized || "download.bin";
+}
+
 export function buildRandomTempFilePath(params: {
   prefix: string;
   extension?: string;
@@ -37,3 +44,22 @@ export function buildRandomTempFilePath(params: {
   const uuid = params.uuid?.trim() || crypto.randomUUID();
   return path.join(params.tmpDir ?? os.tmpdir(), `${prefix}-${now}-${uuid}${extension}`);
 }
+
+export async function withTempDownloadPath<T>(
+  params: {
+    prefix: string;
+    fileName?: string;
+    tmpDir?: string;
+  },
+  fn: (tmpPath: string) => Promise<T>,
+): Promise<T> {
+  const tempRoot = params.tmpDir ?? os.tmpdir();
+  const prefix = `${sanitizePrefix(params.prefix)}-`;
+  const dir = await mkdtemp(path.join(tempRoot, prefix));
+  const tmpPath = path.join(dir, sanitizeFileName(params.fileName ?? "download.bin"));
+  try {
+    return await fn(tmpPath);
+  } finally {
+    await rm(dir, { recursive: true, force: true }).catch(() => {});
+  }
+}

@@ -0,0 +1,63 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+
+const DYNAMIC_TMPDIR_JOIN_RE = /path\.join\(os\.tmpdir\(\),\s*`[^`]*\$\{[^`]*`/;
+const RUNTIME_ROOTS = ["src", "extensions"];
+const SKIP_PATTERNS = [
+  /\.test\.tsx?$/,
+  /\.e2e\.tsx?$/,
+  /\.d\.ts$/,
+  /[\\/](?:__tests__|tests)[\\/]/,
+  /[\\/]test-helpers(?:\.[^\\/]+)?\.ts$/,
+];
+
+function shouldSkip(relativePath: string): boolean {
+  return SKIP_PATTERNS.some((pattern) => pattern.test(relativePath));
+}
+
+async function listTsFiles(dir: string): Promise<string[]> {
+  const entries = await fs.readdir(dir, { withFileTypes: true });
+  const out: string[] = [];
+  for (const entry of entries) {
+    if (entry.name === "node_modules" || entry.name === "dist" || entry.name.startsWith(".")) {
+      continue;
+    }
+    const fullPath = path.join(dir, entry.name);
+    if (entry.isDirectory()) {
+      out.push(...(await listTsFiles(fullPath)));
+      continue;
+    }
+    if (!entry.isFile()) {
+      continue;
+    }
+    if (fullPath.endsWith(".ts") || fullPath.endsWith(".tsx")) {
+      out.push(fullPath);
+    }
+  }
+  return out;
+}
+
+describe("temp path guard", () => {
+  it("blocks dynamic template path.join(os.tmpdir(), ...) in runtime source files", async () => {
+    const repoRoot = process.cwd();
+    const offenders: string[] = [];
+
+    for (const root of RUNTIME_ROOTS) {
+      const absRoot = path.join(repoRoot, root);
+      const files = await listTsFiles(absRoot);
+      for (const file of files) {
+        const relativePath = path.relative(repoRoot, file);
+        if (shouldSkip(relativePath)) {
+          continue;
+        }
+        const source = await fs.readFile(file, "utf-8");
+        if (DYNAMIC_TMPDIR_JOIN_RE.test(source)) {
+          offenders.push(relativePath);
+        }
+      }
+    }
+
+    expect(offenders).toEqual([]);
+  });
+});

@@ -1,7 +1,8 @@
 import fs from "fs";
+import os from "os";
 import path from "path";
 import { Readable } from "stream";
-import { buildRandomTempFilePath, type ClawdbotConfig } from "openclaw/plugin-sdk";
+import type { ClawdbotConfig } from "openclaw/plugin-sdk";
 import { resolveFeishuAccount } from "./accounts.js";
 import { createFeishuClient } from "./client.js";
 import { getFeishuRuntime } from "./runtime.js";
@@ -19,9 +20,22 @@ export type DownloadMessageResourceResult = {
   fileName?: string;
 };
 
+async function withTempDownloadPath<T>(
+  prefix: string,
+  fn: (tmpPath: string) => Promise<T>,
+): Promise<T> {
+  const dir = await fs.promises.mkdtemp(path.join(os.tmpdir(), prefix));
+  const tmpPath = path.join(dir, "download.bin");
+  try {
+    return await fn(tmpPath);
+  } finally {
+    await fs.promises.rm(dir, { recursive: true, force: true }).catch(() => {});
+  }
+}
+
 async function readFeishuResponseBuffer(params: {
   response: unknown;
-  tmpPath: string;
+  tmpDirPrefix: string;
   errorPrefix: string;
 }): Promise<Buffer> {
   const { response } = params;
@@ -52,10 +66,10 @@ async function readFeishuResponseBuffer(params: {
     return Buffer.concat(chunks);
   }
   if (typeof responseAny.writeFile === "function") {
-    await responseAny.writeFile(params.tmpPath);
-    const buffer = await fs.promises.readFile(params.tmpPath);
-    await fs.promises.unlink(params.tmpPath).catch(() => {});
-    return buffer;
+    return await withTempDownloadPath(params.tmpDirPrefix, async (tmpPath) => {
+      await responseAny.writeFile(tmpPath);
+      return await fs.promises.readFile(tmpPath);
+    });
   }
   if (typeof responseAny[Symbol.asyncIterator] === "function") {
     const chunks: Buffer[] = [];
@@ -98,10 +112,9 @@ export async function downloadImageFeishu(params: {
     path: { image_key: imageKey },
   });
 
-  const tmpPath = buildRandomTempFilePath({ prefix: "feishu_img" });
   const buffer = await readFeishuResponseBuffer({
     response,
-    tmpPath,
+    tmpDirPrefix: "openclaw-feishu-img-",
     errorPrefix: "Feishu image download failed",
   });
   return { buffer };
@@ -131,10 +144,9 @@ export async function downloadMessageResourceFeishu(params: {
     params: { type },
   });
 
-  const tmpPath = buildRandomTempFilePath({ prefix: "feishu" });
   const buffer = await readFeishuResponseBuffer({
     response,
-    tmpPath,
+    tmpDirPrefix: "openclaw-feishu-resource-",
     errorPrefix: "Feishu message resource download failed",
   });
   return { buffer };

@@ -1,3 +1,6 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 
 const createFeishuClientMock = vi.hoisted(() => vi.fn());
@@ -7,7 +10,9 @@ const resolveReceiveIdTypeMock = vi.hoisted(() => vi.fn());
 const loadWebMediaMock = vi.hoisted(() => vi.fn());
 
 const fileCreateMock = vi.hoisted(() => vi.fn());
+const imageGetMock = vi.hoisted(() => vi.fn());
 const messageCreateMock = vi.hoisted(() => vi.fn());
+const messageResourceGetMock = vi.hoisted(() => vi.fn());
 const messageReplyMock = vi.hoisted(() => vi.fn());
 
 vi.mock("./client.js", () => ({
@@ -31,7 +36,7 @@ vi.mock("./runtime.js", () => ({
   }),
 }));
 
-import { sendMediaFeishu } from "./media.js";
+import { downloadImageFeishu, downloadMessageResourceFeishu, sendMediaFeishu } from "./media.js";
 
 describe("sendMediaFeishu msg_type routing", () => {
   beforeEach(() => {
@@ -54,10 +59,16 @@ describe("sendMediaFeishu msg_type routing", () => {
         file: {
           create: fileCreateMock,
         },
+        image: {
+          get: imageGetMock,
+        },
         message: {
           create: messageCreateMock,
           reply: messageReplyMock,
         },
+        messageResource: {
+          get: messageResourceGetMock,
+        },
       },
     });
 
@@ -82,6 +93,9 @@ describe("sendMediaFeishu msg_type routing", () => {
       kind: "audio",
       contentType: "audio/ogg",
     });
+
+    imageGetMock.mockResolvedValue(Buffer.from("image-bytes"));
+    messageResourceGetMock.mockResolvedValue(Buffer.from("resource-bytes"));
   });
 
   it("uses msg_type=media for mp4", async () => {
@@ -184,4 +198,60 @@ describe("sendMediaFeishu msg_type routing", () => {
     expect(messageCreateMock).not.toHaveBeenCalled();
     expect(messageReplyMock).not.toHaveBeenCalled();
   });
+
+  it("does not include imageKey path segments in temp file path", async () => {
+    const maliciousImageKey = "a/../../../../pwned.txt";
+    let capturedPath: string | undefined;
+
+    imageGetMock.mockResolvedValueOnce({
+      writeFile: async (tmpPath: string) => {
+        capturedPath = tmpPath;
+        await fs.writeFile(tmpPath, Buffer.from("image-data"));
+      },
+    });
+
+    const result = await downloadImageFeishu({
+      cfg: {} as any,
+      imageKey: maliciousImageKey,
+    });
+
+    expect(result.buffer).toEqual(Buffer.from("image-data"));
+    expect(capturedPath).toBeDefined();
+    expect(capturedPath).not.toContain(maliciousImageKey);
+    expect(capturedPath).not.toContain("..");
+
+    const tmpRoot = path.resolve(os.tmpdir());
+    const resolved = path.resolve(capturedPath as string);
+    const rel = path.relative(tmpRoot, resolved);
+    expect(rel === ".." || rel.startsWith(`..${path.sep}`)).toBe(false);
+  });
+
+  it("does not include fileKey path segments in temp file path", async () => {
+    const maliciousFileKey = "x/../../../../../etc/hosts";
+    let capturedPath: string | undefined;
+
+    messageResourceGetMock.mockResolvedValueOnce({
+      writeFile: async (tmpPath: string) => {
+        capturedPath = tmpPath;
+        await fs.writeFile(tmpPath, Buffer.from("resource-data"));
+      },
+    });
+
+    const result = await downloadMessageResourceFeishu({
+      cfg: {} as any,
+      messageId: "om_123",
+      fileKey: maliciousFileKey,
+      type: "image",
+    });
+
+    expect(result.buffer).toEqual(Buffer.from("resource-data"));
+    expect(capturedPath).toBeDefined();
+    expect(capturedPath).not.toContain(maliciousFileKey);
+    expect(capturedPath).not.toContain("..");
+
+    const tmpRoot = path.resolve(os.tmpdir());
+    const resolved = path.resolve(capturedPath as string);
+    const rel = path.relative(tmpRoot, resolved);
+    expect(rel === ".." || rel.startsWith(`..${path.sep}`)).toBe(false);
+  });
 });

@@ -1,4 +1,5 @@
 import fs from "fs";
+import crypto from "node:crypto";
 import os from "os";
 import path from "path";
 import { Readable } from "stream";
@@ -99,7 +100,7 @@ export async function downloadImageFeishu(params: {
     path: { image_key: imageKey },
   });
 
-  const tmpPath = path.join(os.tmpdir(), `feishu_img_${Date.now()}_${imageKey}`);
+  const tmpPath = path.join(os.tmpdir(), `feishu_img_${Date.now()}_${crypto.randomUUID()}`);
   const buffer = await readFeishuResponseBuffer({
     response,
     tmpPath,
@@ -132,7 +133,7 @@ export async function downloadMessageResourceFeishu(params: {
     params: { type },
   });
 
-  const tmpPath = path.join(os.tmpdir(), `feishu_${Date.now()}_${fileKey}`);
+  const tmpPath = path.join(os.tmpdir(), `feishu_${Date.now()}_${crypto.randomUUID()}`);
   const buffer = await readFeishuResponseBuffer({
     response,
     tmpPath,