Bump to v4.17.12.

template.js

@@ -20,6 +20,12 @@ define(['./assignInWith', './attempt', './_baseValues', './_customDefaultsAssign
   /** Used to match unescaped characters in compiled string literals. */
   var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
 
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
+
   /**
    * Creates a compiled template function that can interpolate data properties
    * in "interpolate" delimiters, HTML-escape interpolated data properties in
@@ -155,7 +161,14 @@ define(['./assignInWith', './attempt', './_baseValues', './_customDefaultsAssign
     , 'g');
 
     // Use a sourceURL for easier debugging.
-    var sourceURL = 'sourceURL' in options ? '//# sourceURL=' + options.sourceURL + '\n' : '';
+    // The sourceURL gets injected into the source that's eval-ed, so be careful
+    // with lookup (in case of e.g. prototype pollution), and strip newlines if any.
+    // A newline wouldn't be a valid sourceURL anyway, and it'd enable code injection.
+    var sourceURL = hasOwnProperty.call(options, 'sourceURL')
+      ? ('//# sourceURL=' +
+         (options.sourceURL + '').replace(/[\r\n]/g, ' ') +
+         '\n')
+      : '';
 
     string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
       interpolateValue || (interpolateValue = esTemplateValue);
@@ -186,7 +199,9 @@ define(['./assignInWith', './attempt', './_baseValues', './_customDefaultsAssign
 
     // If `variable` is not specified wrap a with-statement around the generated
     // code to add the data object to the top of the scope chain.
-    var variable = options.variable;
+    // Like with sourceURL, we take care to not check the option's prototype,
+    // as this configuration is a code injection vector.
+    var variable = hasOwnProperty.call(options, 'variable') && options.variable;
     if (!variable) {
       source = 'with (obj) {\n' + source + '\n}\n';
     }