--- a/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/JSType.java	Wed Mar 25 14:39:39 2015 +0300
+++ b/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/JSType.java	Wed Mar 25 14:41:47 2015 +0100
@@ -933,11 +933,15 @@
         if (start + 1 < end && f == '0' && Character.toLowerCase(str.charAt(start + 1)) == 'x') {
             //decode hex string
             value = parseRadix(str.toCharArray(), start + 2, end, 16);
+        } else if (f == 'I' && end - start == 8 && str.regionMatches(start, "Infinity", 0, 8)) {
+            return negative ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
         } else {
-            // Fast (no NumberFormatException) path to NaN for non-numeric strings. We allow those starting with "I" or
-            // "N" to allow for parsing "NaN" and "Infinity" correctly.
-            if ((f < '0' || f > '9') && f != '.' && f != 'I' && f != 'N') {
-                return Double.NaN;
+            // Fast (no NumberFormatException) path to NaN for non-numeric strings.
+            for (int i = start; i < end; i++) {
+                f = str.charAt(i);
+                if ((f < '0' || f > '9') && f != '.' && f != 'e' && f != 'E' && f != '+' && f != '-') {
+                    return Double.NaN;
+                }
             }
             try {
                 value = Double.parseDouble(str.substring(start, end));

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/script/basic/JDK-8075927.js	Wed Mar 25 14:41:47 2015 +0100
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8075927: toNumber(String) accepts illegal characters
+ *
+ * @test
+ * @run
+ */
+
+Assert.assertTrue(isNaN(Number("-123d")));
+Assert.assertTrue(isNaN(Number("-123f")));
+Assert.assertTrue(Number("   123 ") === 123);
+Assert.assertTrue(Number("  -123 ") === -123);
+Assert.assertEquals(Number("  Infinity  "), Infinity);
+Assert.assertEquals(Number(" +Infinity  "), Infinity);
+Assert.assertEquals(Number(" -Infinity  "), -Infinity);
+