diff --git a/Lib/http/cookies.py b/Lib/http/cookies.py
index a6de6d5..7ec9274 100644
--- a/Lib/http/cookies.py
+++ b/Lib/http/cookies.py
@@ -533,10 +533,17 @@
         return
 
     def __parse_string(self, str, patt=_CookiePattern):
-        i = 0            # Our starting point
-        n = len(str)     # Length of string
-        M = None         # current morsel
+        i = 0                 # Our starting point
+        n = len(str)          # Length of string
+        parsed_items = []     # Parsed (type, key, value) triples
+        morsel_seen = False   # A key=value pair was previously encountered
 
+        TYPE_ATTRIBUTE = 1
+        TYPE_KEYVALUE = 2
+
+        # We first parse the whole cookie string and reject it if it's
+        # syntactically invalid (this helps avoid some classes of injection
+        # attacks).
         while 0 <= i < n:
             # Start looking for a cookie
             match = patt.match(str, i)
@@ -547,22 +554,41 @@
             key, value = match.group("key"), match.group("val")
             i = match.end(0)
 
-            # Parse the key, value in case it's metainfo
             if key[0] == "$":
-                # We ignore attributes which pertain to the cookie
-                # mechanism as a whole.  See RFC 2109.
-                # (Does anyone care?)
-                if M:
-                    M[key[1:]] = value
+                if not morsel_seen:
+                    # We ignore attributes which pertain to the cookie
+                    # mechanism as a whole, such as "$Version".
+                    # See RFC 2965. (Does anyone care?)
+                    continue
+                parsed_items.append((TYPE_ATTRIBUTE, key[1:], value))
             elif key.lower() in Morsel._reserved:
-                if M:
-                    if value is None:
-                        if key.lower() in Morsel._flags:
-                            M[key] = True
+                if not morsel_seen:
+                    # Invalid cookie string
+                    return
+                if value is None:
+                    if key.lower() in Morsel._flags:
+                        parsed_items.append((TYPE_ATTRIBUTE, key, True))
                     else:
-                        M[key] = _unquote(value)
+                        # Invalid cookie string
+                        return
+                else:
+                    parsed_items.append((TYPE_ATTRIBUTE, key, _unquote(value)))
             elif value is not None:
-                rval, cval = self.value_decode(value)
+                parsed_items.append((TYPE_KEYVALUE, key, self.value_decode(value)))
+                morsel_seen = True
+            else:
+                # Invalid cookie string
+                return
+
+        # The cookie string is valid, apply it.
+        M = None         # current morsel
+        for tp, key, value in parsed_items:
+            if tp == TYPE_ATTRIBUTE:
+                assert M is not None
+                M[key] = value
+            else:
+                assert tp == TYPE_KEYVALUE
+                rval, cval = value
                 self.__set(key, rval, cval)
                 M = self[key]