diff --git a/apps/oxlint/src-js/plugins/load.ts b/apps/oxlint/src-js/plugins/load.ts
index 73f9a429c25a3..8351af794696c 100644
--- a/apps/oxlint/src-js/plugins/load.ts
+++ b/apps/oxlint/src-js/plugins/load.ts
@@ -1,4 +1,5 @@
 import { createContext } from "./context.js";
+import { deepFreezeJsonArray } from "./json.js";
 import { DEFAULT_OPTIONS } from "./options.js";
 import { getErrorMessage } from "../utils/utils.js";
 
@@ -166,6 +167,7 @@ function registerPlugin(plugin: Plugin, packageName: string | null): PluginDetai
         if (!isArray(inputDefaultOptions)) {
           throw new TypeError("`rule.meta.defaultOptions` must be an array if provided");
         }
+        deepFreezeJsonArray(inputDefaultOptions);
         defaultOptions = inputDefaultOptions;
       }
 
diff --git a/apps/oxlint/test/fixtures/options/output.snap.md b/apps/oxlint/test/fixtures/options/output.snap.md
index d31f8142310b5..1986f2f332bac 100644
--- a/apps/oxlint/test/fixtures/options/output.snap.md
+++ b/apps/oxlint/test/fixtures/options/output.snap.md
@@ -3,13 +3,40 @@
 
 # stdout
 ```
-  x options-plugin(default-options): options: ["string",123,true,{"toBe":false,"notToBe":true}]
+  x options-plugin(default-options):
+  | options: [
+  |   "string",
+  |   123,
+  |   true,
+  |   {
+  |     "toBe": false,
+  |     "notToBe": true
+  |   },
+  |   {
+  |     "deep": [
+  |       {
+  |         "deeper": {
+  |           "evenDeeper": [
+  |             {
+  |               "soDeep": {
+  |                 "soSoDeep": true
+  |               }
+  |             }
+  |           ]
+  |         }
+  |       }
+  |     ]
+  |   }
+  | ]
+  | isDeepFrozen: true
    ,-[files/index.js:1:1]
  1 | debugger;
    : ^
    `----
 
-  x options-plugin(options): options: []
+  x options-plugin(options):
+  | options: []
+  | isDeepFrozen: true
    ,-[files/index.js:1:1]
  1 | debugger;
    : ^
diff --git a/apps/oxlint/test/fixtures/options/plugin.ts b/apps/oxlint/test/fixtures/options/plugin.ts
index c70aa3b72b7a9..f7688f0ac88f6 100644
--- a/apps/oxlint/test/fixtures/options/plugin.ts
+++ b/apps/oxlint/test/fixtures/options/plugin.ts
@@ -18,7 +18,9 @@ const plugin: Plugin = {
     options: {
       create(context) {
         context.report({
-          message: `options: ${JSON.stringify(context.options)}`,
+          message:
+            `\noptions: ${JSON.stringify(context.options, null, 2)}\n` +
+            `isDeepFrozen: ${isDeepFrozen(context.options)}`,
           node: SPAN,
         });
         return {};
@@ -26,11 +28,19 @@ const plugin: Plugin = {
     },
     "default-options": {
       meta: {
-        defaultOptions: ["string", 123, true, { toBe: false, notToBe: true }],
+        defaultOptions: [
+          "string",
+          123,
+          true,
+          { toBe: false, notToBe: true },
+          { deep: [{ deeper: { evenDeeper: [{ soDeep: { soSoDeep: true } }] } }] },
+        ],
       },
       create(context) {
         context.report({
-          message: `options: ${JSON.stringify(context.options)}`,
+          message:
+            `\noptions: ${JSON.stringify(context.options, null, 2)}\n` +
+            `isDeepFrozen: ${isDeepFrozen(context.options)}`,
           node: SPAN,
         });
         return {};
@@ -40,3 +50,10 @@ const plugin: Plugin = {
 };
 
 export default plugin;
+
+function isDeepFrozen(value: unknown): boolean {
+  if (value === null || typeof value !== "object") return true;
+  if (!Object.isFrozen(value)) return false;
+  if (Array.isArray(value)) return value.every(isDeepFrozen);
+  return Object.values(value).every(isDeepFrozen);
+}