lodash

Index: package/lodash.js
===================================================================
--- package/lodash.js
+++ package/lodash.js
@@ -11,16 +11,17 @@
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.17.20';
+  var VERSION = '4.17.21';
 
   /** Used as the size to enable large array optimizations. */
   var LARGE_ARRAY_SIZE = 200;
 
   /** Error message constants. */
   var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
-      FUNC_ERROR_TEXT = 'Expected a function';
+      FUNC_ERROR_TEXT = 'Expected a function',
+      INVALID_TEMPL_VAR_ERROR_TEXT = 'Invalid `variable` option passed into `_.template`';
 
   /** Used to stand-in for `undefined` hash values. */
   var HASH_UNDEFINED = '__lodash_hash_undefined__';
 
@@ -151,21 +152,34 @@
    */
   var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
       reHasRegExpChar = RegExp(reRegExpChar.source);
 
-  /** Used to match leading and trailing whitespace. */
-  var reTrim = /^\s+|\s+$/g,
-      reTrimStart = /^\s+/,
-      reTrimEnd = /\s+$/;
+  /** Used to match leading whitespace. */
+  var reTrimStart = /^\s+/;
 
+  /** Used to match a single whitespace character. */
+  var reWhitespace = /\s/;
+
   /** Used to match wrap detail comments. */
   var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
       reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
       reSplitDetails = /,? & /;
 
   /** Used to match words composed of alphanumeric characters. */
   var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
 
+  /**
+   * Used to validate the `validate` option in `_.template` variable.
+   *
+   * Forbids characters which could potentially change the meaning of the function argument definition:
+   * - "()," (modification of function parameters)
+   * - "=" (default value)
+   * - "[]{}" (destructuring of function parameters)
+   * - "/" (beginning of a comment)
+   * - whitespace
+   */
+  var reForbiddenIdentifierChars = /[()=,{}\[\]\/\s]/;
+
   /** Used to match backslashes in property paths. */
   var reEscapeChar = /\\(\\)?/g;
 
   /**
@@ -993,8 +1007,21 @@
     });
   }
 
   /**
+   * The base implementation of `_.trim`.
+   *
+   * @private
+   * @param {string} string The string to trim.
+   * @returns {string} Returns the trimmed string.
+   */
+  function baseTrim(string) {
+    return string
+      ? string.slice(0, trimmedEndIndex(string) + 1).replace(reTrimStart, '')
+      : string;
+  }
+
+  /**
    * The base implementation of `_.unary` without support for storing metadata.
    *
    * @private
    * @param {Function} func The function to cap arguments for.
@@ -1326,8 +1353,23 @@
       : asciiToArray(string);
   }
 
   /**
+   * Used by `_.trim` and `_.trimEnd` to get the index of the last non-whitespace
+   * character of `string`.
+   *
+   * @private
+   * @param {string} string The string to inspect.
+   * @returns {number} Returns the index of the last non-whitespace character.
+   */
+  function trimmedEndIndex(string) {
+    var index = string.length;
+
+    while (index-- && reWhitespace.test(string.charAt(index))) {}
+    return index;
+  }
+
+  /**
    * Used by `_.unescape` to convert HTML entities to characters.
    *
    * @private
    * @param {string} chr The matched character to unescape.
@@ -12493,9 +12535,9 @@
       }
       if (typeof value != 'string') {
         return value === 0 ? value : +value;
       }
-      value = value.replace(reTrim, '');
+      value = baseTrim(value);
       var isBinary = reIsBinary.test(value);
       return (isBinary || reIsOctal.test(value))
         ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
         : (reIsBadHex.test(value) ? NAN : +value);
@@ -14865,8 +14907,14 @@
       var variable = hasOwnProperty.call(options, 'variable') && options.variable;
       if (!variable) {
         source = 'with (obj) {\n' + source + '\n}\n';
       }
+      // Throw an error if a forbidden character was found in `variable`, to prevent
+      // potential command injection attacks.
+      else if (reForbiddenIdentifierChars.test(variable)) {
+        throw new Error(INVALID_TEMPL_VAR_ERROR_TEXT);
+      }
+
       // Cleanup code by stripping empty strings.
       source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
         .replace(reEmptyStringMiddle, '$1')
         .replace(reEmptyStringTrailing, '$1;');
@@ -14978,9 +15026,9 @@
      */
     function trim(string, chars, guard) {
       string = toString(string);
       if (string && (guard || chars === undefined)) {
-        return string.replace(reTrim, '');
+        return baseTrim(string);
       }
       if (!string || !(chars = baseToString(chars))) {
         return string;
       }
@@ -15013,9 +15061,9 @@
      */
     function trimEnd(string, chars, guard) {
       string = toString(string);
       if (string && (guard || chars === undefined)) {
-        return string.replace(reTrimEnd, '');
+        return string.slice(0, trimmedEndIndex(string) + 1);
       }
       if (!string || !(chars = baseToString(chars))) {
         return string;
       }