diff --git a/packages/rapidoc/src/utils/spec-parser.js b/packages/rapidoc/src/utils/spec-parser.js
index a3d6a350..b2d2c840 100644
--- a/packages/rapidoc/src/utils/spec-parser.js
+++ b/packages/rapidoc/src/utils/spec-parser.js
@@ -593,7 +593,7 @@ function groupByTags(openApiSpec, sortEndpointsBy = 'none', generateMissingTags
             responses: pathOrHookObj.responses,
             callbacks: pathOrHookObj.callbacks,
             deprecated: pathOrHookObj.deprecated,
-            security: pathOrHookObj.security,
+            security: pathOrHookObj.security ?? openApiSpec.security,
             // commonSummary: commonPathProp.summary,
             // commonDescription: commonPathProp.description,
             xBadges: pathOrHookObj['x-badges'] || undefined,
diff --git a/tests/unit/spec-parser-security.test.js b/tests/unit/spec-parser-security.test.js
new file mode 100644
index 00000000..124b29b3
--- /dev/null
+++ b/tests/unit/spec-parser-security.test.js
@@ -0,0 +1,41 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+import ProcessSpec from '../../packages/rapidoc/src/utils/spec-parser.js';
+
+describe('operation security inheritance', () => {
+  const cases = [
+    ['inherits root security', [{ bearerAuth: [] }], undefined, [{ bearerAuth: [] }]],
+    ['preserves explicit public access', [{ bearerAuth: [] }], [], []],
+    ['preserves operation overrides', [{ bearerAuth: [] }], [{ otherAuth: [] }], [{ otherAuth: [] }]],
+    ['preserves optional authentication', [{ bearerAuth: [] }], [{}, { bearerAuth: [] }], [{}, { bearerAuth: [] }]],
+    ['has no requirements when neither level declares security', undefined, undefined, undefined],
+  ];
+
+  for (const [name, rootSecurity, operationSecurity, expected] of cases) {
+    it(name, async () => {
+      const operation = { responses: { 200: { description: 'OK' } } };
+      const spec = {
+        openapi: '3.0.3',
+        info: { title: 'Security inheritance', version: '1.0.0' },
+        paths: { '/example': { get: operation } },
+        components: {
+          securitySchemes: {
+            bearerAuth: { type: 'http', scheme: 'bearer' },
+            otherAuth: { type: 'http', scheme: 'basic' },
+          },
+        },
+      };
+
+      if (rootSecurity !== undefined) {
+        spec.security = rootSecurity;
+      }
+      if (operationSecurity !== undefined) {
+        operation.security = operationSecurity;
+      }
+
+      const result = await ProcessSpec.call({ requestUpdate() {}, dispatchEvent() {} }, spec);
+      assert.strictEqual(result.specLoadError, false);
+      assert.deepStrictEqual(result.tags[0].paths[0].security, expected);
+    });
+  }
+});