diff --git a/src/security/audit-extra.async.test.ts b/src/security/audit-extra.async.test.ts
index e793ef41071f..2d5d8a02a0d6 100644
--- a/src/security/audit-extra.async.test.ts
+++ b/src/security/audit-extra.async.test.ts
@@ -295,6 +295,25 @@ Read the requested file and summarize it.
     ).toBe(false);
   });
 
+  it("surfaces manifest_parse_error finding when plugin package.json exceeds the size limit", async () => {
+    const tmpDir = await makeTmpDir("audit-manifest-oversized");
+    const pluginDir = path.join(tmpDir, "extensions", "oversized-plugin");
+    await fs.mkdir(pluginDir, { recursive: true });
+    // Oversized manifest — simulates a plugin trying to exhaust the audit reader
+    // by declaring a huge package.json, hiding its declared extension entrypoints.
+    await fs.writeFile(path.join(pluginDir, "package.json"), "x".repeat(1024 * 1024 + 1), "utf-8");
+
+    const findings = await collectPluginsCodeSafetyFindings({ stateDir: tmpDir });
+    const finding = requireFinding(
+      findings,
+      (f) => f.checkId === "plugins.code_safety.manifest_parse_error",
+      "oversized manifest parse error",
+    );
+    expect(finding.severity).toBe("warn");
+    expect(finding.detail).toContain("oversized-plugin");
+    expect(finding.detail).toContain("too large");
+  });
+
   it("reports scan_failed when plugin code scanner throws during deep audit", async () => {
     const scanSpy = vi
       .spyOn(skillScanner, "scanDirectoryWithSummary")
diff --git a/src/security/audit-extra.async.ts b/src/security/audit-extra.async.ts
index 47251766f414..ac78390dbc78 100644
--- a/src/security/audit-extra.async.ts
+++ b/src/security/audit-extra.async.ts
@@ -3,7 +3,6 @@
  *
  * These functions perform I/O (filesystem, config reads) to detect security issues.
  */
-import fs from "node:fs/promises";
 import path from "node:path";
 import { clearTimeout as clearNodeTimeout, setTimeout as setNodeTimeout } from "node:timers";
 import {
@@ -21,6 +20,7 @@ import { MANIFEST_KEY } from "../compat/legacy-names.js";
 import type { OpenClawConfig, ConfigFileSnapshot } from "../config/config.js";
 import { collectIncludePathsRecursive } from "../config/includes-scan.js";
 import { resolveOAuthDir } from "../config/paths.js";
+import { readRegularFile, statRegularFile } from "../infra/fs-safe.js";
 import { normalizeAgentId } from "../routing/session-key.js";
 import { getOrCreatePromise } from "../shared/lazy-promise.js";
 import { createLazyRuntimeModule, createLazyRuntimeNamedExport } from "../shared/lazy-runtime.js";
@@ -97,9 +97,25 @@ function expandTilde(p: string, env: NodeJS.ProcessEnv): string | null {
   return null;
 }
 
+const MAX_PLUGIN_MANIFEST_BYTES = 1024 * 1024;
+
 async function readPluginManifestExtensions(pluginPath: string): Promise<string[]> {
   const manifestPath = path.join(pluginPath, "package.json");
-  const raw = await fs.readFile(manifestPath, "utf-8").catch(() => "");
+  const statResult = await statRegularFile(manifestPath);
+  if (statResult.missing) {
+    return [];
+  }
+  if (statResult.stat.size > MAX_PLUGIN_MANIFEST_BYTES) {
+    throw new Error(
+      `Plugin manifest at ${manifestPath} is too large (${statResult.stat.size} bytes, max ${MAX_PLUGIN_MANIFEST_BYTES})`,
+    );
+  }
+
+  const { buffer } = await readRegularFile({
+    filePath: manifestPath,
+    maxBytes: MAX_PLUGIN_MANIFEST_BYTES,
+  });
+  const raw = buffer.toString("utf-8");
   if (!raw.trim()) {
     return [];
   }