diff --git a/Lib/http/cookies.py b/Lib/http/cookies.py
--- a/Lib/http/cookies.py
+++ b/Lib/http/cookies.py
@@ -576,6 +576,12 @@ class BaseCookie(dict):
             # Start looking for a cookie
             match = patt.match(str, i)
             if not match:
+                semicolon_index = str.find(';', i)
+                if semicolon_index != -1:
+                    # Skip over invalid cookie
+                    i = semicolon_index + 1
+                    morsel_seen = False
+                    continue
                 # No more cookies
                 break
 
diff --git a/Lib/test/test_http_cookies.py b/Lib/test/test_http_cookies.py
--- a/Lib/test/test_http_cookies.py
+++ b/Lib/test/test_http_cookies.py
@@ -56,7 +56,16 @@
                     'Set-Cookie: d=r',
                     'Set-Cookie: f=h'
                 ))
-            }
+            },
+            {
+                'data': 'a=b; messages=["\"]; c=d;',
+                'dict': {'a':'b', 'c':'d'},
+                'repr': "<SimpleCookie: a='b' c='d'>",
+                'output': '\n'.join((
+                    'Set-Cookie: a=b',
+                    'Set-Cookie: c=d',
+                ))
+            },
         ]
 
         for case in cases: