diff --git a/test/utils/cryptography/RSA.test.js b/test/utils/cryptography/RSA.test.js
index 6f7edea46e1..4e14e96743e 100644
--- a/test/utils/cryptography/RSA.test.js
+++ b/test/utils/cryptography/RSA.test.js
@@ -41,6 +41,18 @@ describe('RSA', function () {
   });
 
   describe('others tests', function () {
+    it('should fail if s >= n', async function () {
+      const data = ethers.toUtf8Bytes('hello world');
+      const sig =
+        '0x079bed733b48d69bdb03076cb17d9809072a5a765460bc72072d687dba492afe951d75b814f561f253ee5cc0f3d703b6eab5b5df635b03a5437c0a5c179309812f5b5c97650361c645bc99f806054de21eb187bc0a704ed38d3d4c2871a117c19b6da7e9a3d808481c46b22652d15b899ad3792da5419e50ee38759560002388';
+      const exp =
+        '0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010001';
+      const mod =
+        '0xdf3edde009b96bc5b03b48bd73fe70a3ad20eaf624d0dc1ba121a45cc739893741b7cf82acf1c91573ec8266538997c6699760148de57e54983191eca0176f518e547b85fe0bb7d9e150df19eee734cf5338219c7f8f7b13b39f5384179f62c135e544cb70be7505751f34568e06981095aeec4f3a887639718a3e11d48c240d';
+      const sig2 = ethers.toBeHex(ethers.toBigInt(sig) + ethers.toBigInt(mod));
+      expect(await this.mock.$pkcs1Sha256(data, sig2, exp, mod)).to.be.false;
+    });
+
     it('openssl', async function () {
       const data = ethers.toUtf8Bytes('hello world');
       const sig =