diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1a971b5af..9b663c817 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -45,6 +45,32 @@ jobs:
           node-version: '20'
           registry-url: 'https://registry.npmjs.org'
 
+      - name: Fetch checksums.txt from GitHub Release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release download "${GITHUB_REF_NAME}" \
+            --repo "${GITHUB_REPOSITORY}" \
+            --pattern checksums.txt \
+            --dir .
+
+      - name: Verify checksums.txt is present and matches current version
+        run: |
+          set -euo pipefail
+          test -s checksums.txt
+          VERSION="${GITHUB_REF_NAME#v}"
+          for plat in \
+            "linux-amd64.tar.gz"  \
+            "linux-arm64.tar.gz"  \
+            "darwin-amd64.tar.gz" \
+            "darwin-arm64.tar.gz" \
+            "windows-amd64.zip"   \
+            "windows-arm64.zip"
+          do
+            grep -qE '^[0-9a-fA-F]{64}[[:space:]]+\*?lark-cli-'"${VERSION}"'-'"${plat}"'$' checksums.txt \
+              || { echo "checksums.txt missing valid entry for lark-cli-${VERSION}-${plat}"; exit 1; }
+          done
+
       - name: Publish to npm
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
diff --git a/package.json b/package.json
index 4fd7cab98..3a9edcb84 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
   "files": [
     "scripts/install.js",
     "scripts/run.js",
+    "checksums.txt",
     "CHANGELOG.md"
   ]
 }
diff --git a/scripts/install.js b/scripts/install.js
index 3a3b1ecc4..175db7455 100644
--- a/scripts/install.js
+++ b/scripts/install.js
@@ -3,8 +3,13 @@
 
 const fs = require("fs");
 const path = require("path");
-const { execSync } = require("child_process");
+const { execFileSync } = require("child_process");
 const os = require("os");
+const crypto = require("crypto");
+
+class ChecksumError extends Error {}
+class NetworkError extends Error {}
+class PackageIntegrityError extends Error {}
 
 const VERSION = require("../package.json").version;
 const REPO = "larksuite/cli";
@@ -21,78 +26,266 @@ const ARCH_MAP = {
   arm64: "arm64",
 };
 
-const platform = PLATFORM_MAP[process.platform];
-const arch = ARCH_MAP[process.arch];
-
-if (!platform || !arch) {
-  console.error(
-    `Unsupported platform: ${process.platform}-${process.arch}`
-  );
-  process.exit(1);
-}
-
 const isWindows = process.platform === "win32";
 const ext = isWindows ? ".zip" : ".tar.gz";
-const archiveName = `${NAME}-${VERSION}-${platform}-${arch}${ext}`;
-const GITHUB_URL = `https://github.com/${REPO}/releases/download/v${VERSION}/${archiveName}`;
-const MIRROR_URL = `https://registry.npmmirror.com/-/binary/lark-cli/v${VERSION}/${archiveName}`;
+
+const ALLOWED_INITIAL_HOSTS = new Set([
+  "github.com",
+  "registry.npmmirror.com",
+]);
+
+const CURL_CONNECT_TIMEOUT_SEC = 10;
+const CURL_MAX_TIME_SEC        = 120;
+const CURL_MAX_REDIRS          = 5;
+
+const DEFAULT_CHECKSUM_PATH = path.join(__dirname, "..", "checksums.txt");
+
+// Defensive: escape single quotes for PowerShell literal-string embedding.
+// tmpDir comes from mkdtempSync so is controlled, but this hardens against
+// future refactors that route external input into the script.
+function escapeSingleQuotes(s) {
+  return s.replace(/'/g, "''");
+}
 
 const binDir = path.join(__dirname, "..", "bin");
 const dest = path.join(binDir, NAME + (isWindows ? ".exe" : ""));
 
-fs.mkdirSync(binDir, { recursive: true });
-
 function download(url, destPath) {
-  // --ssl-revoke-best-effort: on Windows (Schannel), avoid CRYPT_E_REVOCATION_OFFLINE
-  // errors when the certificate revocation list server is unreachable
-  const sslFlag = isWindows ? "--ssl-revoke-best-effort " : "";
-  execSync(
-    `curl ${sslFlag}--fail --location --silent --show-error --connect-timeout 10 --max-time 120 --output "${destPath}" "${url}"`,
-    { stdio: ["ignore", "ignore", "pipe"] }
-  );
-}
+  // JS-layer pre-check: initial URL must be https and in allowlist.
+  // Redirect targets are NOT host-checked; we rely on curl's
+  // --proto-redir =https + --max-redirs + SHA256 verify for safety.
+  const parsed = new URL(url);
+  if (parsed.protocol !== "https:") {
+    throw new NetworkError(`Non-HTTPS URL rejected: ${url}`);
+  }
+  if (!ALLOWED_INITIAL_HOSTS.has(parsed.hostname)) {
+    throw new NetworkError(`Untrusted initial host: ${parsed.hostname}`);
+  }
 
-function install() {
-  const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "lark-cli-"));
-  const archivePath = path.join(tmpDir, archiveName);
+  const args = [
+    "--fail",                                     // HTTP 4xx/5xx -> non-zero exit
+    "--location",                                 // follow redirects
+    "--proto",       "=https",                    // initial URL: https only
+    "--proto-redir", "=https",                    // redirect targets: https only
+    "--max-redirs",  String(CURL_MAX_REDIRS),
+    "--tlsv1.2",                                  // minimum TLS 1.2
+    "--connect-timeout", String(CURL_CONNECT_TIMEOUT_SEC),
+    "--max-time",        String(CURL_MAX_TIME_SEC),
+    "--silent", "--show-error",
+    "--output", destPath,
+  ];
+
+  if (isWindows) {
+    // Schannel CRL check hard-fails when the CRL server is unreachable;
+    // this flag was in the original install.js and is preserved to
+    // avoid regression for users in corporate networks.
+    args.unshift("--ssl-revoke-best-effort");
+  }
+
+  // URL is always the last positional arg.
+  args.push(url);
 
   try {
+    execFileSync("curl", args, {
+      stdio: ["ignore", "ignore", "pipe"],
+    });
+  } catch (err) {
+    if (err.code === "ENOENT") {
+      // ENOENT is NOT a NetworkError: another source won't help (curl
+      // is missing). Throw plain Error so the fallback loop re-raises
+      // instead of silently trying the next URL.
+      throw new Error(
+        "curl is required for installation but was not found in PATH. " +
+        "Install curl or manually download the binary from " +
+        `https://github.com/${REPO}/releases/tag/v${VERSION}`
+      );
+    }
+    const stderr = err.stderr ? err.stderr.toString().trim() : "";
+    const exitCode = err.status != null ? err.status : "unknown";
+    throw new NetworkError(
+      `curl exited with code ${exitCode}${stderr ? ": " + stderr : ""}`
+    );
+  }
+}
+
+function downloadWithFallback(urls, destPath) {
+  const attempts = [];
+  for (const url of urls) {
     try {
-      download(GITHUB_URL, archivePath);
+      download(url, destPath);
+      return url;
     } catch (err) {
-      download(MIRROR_URL, archivePath);
+      if (err instanceof NetworkError) {
+        attempts.push({ url, error: err.message });
+        continue;
+      }
+      // ChecksumError, plain Error (ENOENT), or any other type:
+      // re-raise immediately without trying the next source.
+      throw err;
     }
+  }
+  const detail = attempts
+    .map((a) => `  - ${a.url}\n      ${a.error}`)
+    .join("\n");
+  throw new NetworkError(`All download sources failed:\n${detail}`);
+}
 
-    if (isWindows) {
-      execSync(
-        `powershell -Command "Expand-Archive -Path '${archivePath}' -DestinationPath '${tmpDir}'"`,
-        { stdio: "ignore" }
-      );
-    } else {
-      execSync(`tar -xzf "${archivePath}" -C "${tmpDir}"`, {
-        stdio: "ignore",
-      });
+function extract(archivePath, tmpDir) {
+  if (isWindows) {
+    const script =
+      `$ErrorActionPreference = 'Stop'\n` +
+      `Expand-Archive -LiteralPath '${escapeSingleQuotes(archivePath)}' ` +
+      `-DestinationPath '${escapeSingleQuotes(tmpDir)}' -Force\n`;
+
+    const scriptPath = path.join(tmpDir, "extract.ps1");
+    fs.writeFileSync(scriptPath, script, { encoding: "utf-8" });
+
+    execFileSync("powershell", [
+      "-NoProfile",
+      "-NonInteractive",
+      "-ExecutionPolicy", "Bypass",
+      "-File", scriptPath,
+    ], { stdio: "ignore" });
+  } else {
+    execFileSync("tar", ["-xzf", archivePath, "-C", tmpDir], {
+      stdio: "ignore",
+    });
+  }
+}
+
+function verifyChecksum(filePath, expectedHash) {
+  return new Promise((resolve, reject) => {
+    const hash = crypto.createHash("sha256");
+    const stream = fs.createReadStream(filePath);
+    stream.on("error", reject);
+    stream.on("data", (chunk) => hash.update(chunk));
+    stream.on("end", () => {
+      const actual = hash.digest("hex");
+      const expected = expectedHash.toLowerCase();
+      if (actual !== expected) {
+        reject(new ChecksumError(
+          `SHA256 mismatch for ${path.basename(filePath)}\n` +
+          `  expected: ${expected}\n` +
+          `  actual:   ${actual}`
+        ));
+        return;
+      }
+      resolve();
+    });
+  });
+}
+
+function getExpectedChecksum(archiveFilename, checksumPath = DEFAULT_CHECKSUM_PATH) {
+  if (!fs.existsSync(checksumPath)) {
+    // Packaging bug, not a tamper signal — routed separately.
+    throw new PackageIntegrityError("checksums.txt missing from package");
+  }
+
+  const contents = fs.readFileSync(checksumPath, "utf-8");
+  const lineRegex = /^([0-9a-fA-F]{64})\s+\*?(.+)$/;
+
+  for (const rawLine of contents.split("\n")) {
+    const line = rawLine.trim();
+    if (line === "" || line.startsWith("#")) continue;
+
+    const match = line.match(lineRegex);
+    if (!match) continue;
+
+    const [, hash, filename] = match;
+    if (filename.trim() === archiveFilename) {
+      return hash.toLowerCase();
     }
+  }
+
+  throw new ChecksumError(`No checksum entry for ${archiveFilename}`);
+}
+
+async function install() {
+  const platform = PLATFORM_MAP[process.platform];
+  const arch = ARCH_MAP[process.arch];
+  if (!platform || !arch) {
+    throw new Error(
+      `Unsupported platform: ${process.platform}-${process.arch}. ` +
+      `Download manually from ` +
+      `https://github.com/${REPO}/releases/tag/v${VERSION}`
+    );
+  }
+  const archiveName = `${NAME}-${VERSION}-${platform}-${arch}${ext}`;
+  const sources = [
+    `https://github.com/${REPO}/releases/download/v${VERSION}/${archiveName}`,
+    `https://registry.npmmirror.com/-/binary/lark-cli/v${VERSION}/${archiveName}`,
+  ];
+
+  const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "lark-cli-"));
+  const archivePath = path.join(tmpDir, archiveName);
+
+  try {
+    // 1. Early fail: if the bundled checksums.txt is broken,
+    //    report now before spending bandwidth.
+    const expectedHash = getExpectedChecksum(archiveName);
+
+    // 2. Multi-source download; only NetworkError triggers fallback.
+    const sourceUrl = downloadWithFallback(sources, archivePath);
 
+    // 3. Integrity check outside the fallback loop. Mismatch aborts
+    //    the entire install, does NOT try the next source.
+    await verifyChecksum(archivePath, expectedHash);
+
+    // 4. Extract (safe: bytes match the official release).
+    extract(archivePath, tmpDir);
+
+    // 5. Copy binary into place and chmod.
     const binaryName = NAME + (isWindows ? ".exe" : "");
     const extractedBinary = path.join(tmpDir, binaryName);
-
+    fs.mkdirSync(path.dirname(dest), { recursive: true });
     fs.copyFileSync(extractedBinary, dest);
     fs.chmodSync(dest, 0o755);
-    console.log(`${NAME} v${VERSION} installed successfully`);
+
+    console.log(
+      `${NAME} v${VERSION} installed successfully ` +
+      `(from ${new URL(sourceUrl).hostname})`
+    );
   } finally {
+    // 6. Always clean up the temp directory.
     fs.rmSync(tmpDir, { recursive: true, force: true });
   }
 }
 
-try {
-  install();
-} catch (err) {
-  console.error(`Failed to install ${NAME}:`, err.message);
-  console.error(
-    `\nIf you are behind a firewall or in a restricted network, try setting a proxy:\n` +
-    `  export https_proxy=http://your-proxy:port\n` +
-    `  npm install -g @larksuite/cli`
-  );
-  process.exit(1);
+if (require.main === module) {
+  install().catch((err) => {
+    if (err instanceof PackageIntegrityError) {
+      console.error(`\n${NAME} install aborted: the installed package looks broken.\n`);
+      console.error(err.message);
+      console.error(
+        `\nRe-install the package; if the issue persists, please report it:\n` +
+        `  https://github.com/${REPO}/issues\n`
+      );
+    } else if (err instanceof ChecksumError) {
+      console.error(`\n[SECURITY] ${NAME} install aborted due to integrity check failure:\n`);
+      console.error(err.message);
+      console.error(
+        `\nRetry the install; if it persists, report it and download manually:\n` +
+        `  https://github.com/${REPO}/releases/tag/v${VERSION}\n`
+      );
+    } else if (err instanceof NetworkError) {
+      console.error(`\n${NAME} install failed due to network errors:\n`);
+      console.error(err.message);
+      console.error(
+        `\nIf you are behind a firewall or on a restricted network, try configuring a proxy:\n` +
+        `  export https_proxy=http://your-proxy:port\n` +
+        `  npm install -g @larksuite/cli\n`
+      );
+    } else {
+      console.error(`\n${NAME} install failed:\n${err.stack || err.message}`);
+    }
+    process.exit(1);
+  });
 }
+
+module.exports = {
+  verifyChecksum,
+  getExpectedChecksum,
+  ChecksumError,
+  NetworkError,
+  PackageIntegrityError,
+};
diff --git a/scripts/install.test.js b/scripts/install.test.js
new file mode 100644
index 000000000..4b881cb7f
--- /dev/null
+++ b/scripts/install.test.js
@@ -0,0 +1,103 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+const { test } = require("node:test");
+const assert = require("node:assert");
+const fs = require("fs");
+const os = require("os");
+const path = require("path");
+const crypto = require("crypto");
+const {
+  verifyChecksum,
+  getExpectedChecksum,
+  ChecksumError,
+  PackageIntegrityError,
+} = require("./install.js");
+
+function mktmpdir() {
+  return fs.mkdtempSync(path.join(os.tmpdir(), "install-test-"));
+}
+
+test("verifyChecksum: correct hash resolves", async () => {
+  const dir = mktmpdir();
+  try {
+    const filePath = path.join(dir, "data.bin");
+    const bytes = Buffer.from("hello world");
+    fs.writeFileSync(filePath, bytes);
+    const correctHash = crypto.createHash("sha256").update(bytes).digest("hex");
+
+    await verifyChecksum(filePath, correctHash);
+  } finally {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+test("verifyChecksum: mismatched hash throws ChecksumError", async () => {
+  const dir = mktmpdir();
+  try {
+    const filePath = path.join(dir, "data.bin");
+    fs.writeFileSync(filePath, "hello world");
+    const wrongHash = "0".repeat(64);
+
+    await assert.rejects(
+      () => verifyChecksum(filePath, wrongHash),
+      (err) => err instanceof ChecksumError,
+    );
+  } finally {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+test("getExpectedChecksum: returns hash for listed archive", () => {
+  const dir = mktmpdir();
+  try {
+    const checksumsPath = path.join(dir, "checksums.txt");
+    const knownHash = "a".repeat(64);
+    fs.writeFileSync(
+      checksumsPath,
+      `${knownHash}  lark-cli-1.0.0-linux-amd64.tar.gz\n`
+    );
+
+    const result = getExpectedChecksum(
+      "lark-cli-1.0.0-linux-amd64.tar.gz",
+      checksumsPath,
+    );
+    assert.strictEqual(result, knownHash);
+  } finally {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+test("getExpectedChecksum: throws PackageIntegrityError (not ChecksumError) when checksums.txt file is absent", () => {
+  const dir = mktmpdir();
+  try {
+    const missingPath = path.join(dir, "does-not-exist.txt");
+
+    assert.throws(
+      () => getExpectedChecksum("lark-cli-1.0.0-linux-amd64.tar.gz", missingPath),
+      (err) =>
+        err instanceof PackageIntegrityError &&
+        !(err instanceof ChecksumError),
+    );
+  } finally {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+test("getExpectedChecksum: throws ChecksumError when entry missing", () => {
+  const dir = mktmpdir();
+  try {
+    const checksumsPath = path.join(dir, "checksums.txt");
+    fs.writeFileSync(
+      checksumsPath,
+      `${"a".repeat(64)}  some-other-archive.tar.gz\n`
+    );
+
+    assert.throws(
+      () => getExpectedChecksum("nonexistent-archive.tar.gz", checksumsPath),
+      (err) => err instanceof ChecksumError,
+    );
+  } finally {
+    fs.rmSync(dir, { recursive: true, force: true });
+  }
+});