[pitboss] phase 11: Track J.9 + Track L.9 — CRYPTO, JSON_PARSE, UNAUTHORIZED_ID, DATA_EXFIL corpora

tests/dynamic_fixtures/json_parse/javascript/benign.js

@@ -0,0 +1,16 @@
+// Phase 11 (Track J.9) — JavaScript JSON_PARSE benign control fixture.
+//
+// JSON.parse then deep-merge into a `Object.create(null)` target, the
+// canonical mitigation; the prototype-less target cannot reach
+// `Object.prototype` so the canary never fires.
+function run(value) {
+    const parsed = JSON.parse(value);
+    const target = Object.create(null);
+    for (const k of Object.keys(parsed)) {
+        if (k === '__proto__' || k === 'constructor') continue;
+        target[k] = parsed[k];
+    }
+    return target;
+}
+
+module.exports = { run };