crypto/secp256r1: reject the reference pubKey coordinates

crypto/secp256r1/publickey.go

@@ -13,6 +13,11 @@ func newPublicKey(x, y *big.Int) *ecdsa.PublicKey {
 		return nil
 	}
 
+	// Check if the given coordinates are the reference point (infinity)
+	if x.Sign() == 0 && y.Sign() == 0 {
+		return nil
+	}
+
 	return &ecdsa.PublicKey{
 		Curve: elliptic.P256(),
 		X:     x,