diff --git a/django/contrib/auth/tests/tokens.py b/django/contrib/auth/tests/tokens.py
index 03cc1e3c11413..7a641fd81861d 100644
--- a/django/contrib/auth/tests/tokens.py
+++ b/django/contrib/auth/tests/tokens.py
@@ -34,4 +34,9 @@
 >>> p2.check_token(u, tk1)
 False
 
+This will put a 14-digit base36 timestamp into the token, which is too large.
+>>> tk1 = p0._make_token_with_timestamp(u, 175455491841851871349)
+>>> p0.check_token(u, tk1)
+False
+
 """
diff --git a/django/contrib/auth/urls.py b/django/contrib/auth/urls.py
index 4f8a102e667fe..42b4e8f212bd8 100644
--- a/django/contrib/auth/urls.py
+++ b/django/contrib/auth/urls.py
@@ -1,4 +1,4 @@
-# These URLs are normally mapped to /admin/urls.py. This URLs file is 
+# These URLs are normally mapped to /admin/urls.py. This URLs file is
 # provided as a convenience to those who want to deploy these URLs elsewhere.
 # This file is also used to provide a reliable view deployment for test purposes.
 
@@ -11,7 +11,7 @@
     (r'^password_change/done/$', 'django.contrib.auth.views.password_change_done'),
     (r'^password_reset/$', 'django.contrib.auth.views.password_reset'),
     (r'^password_reset/done/$', 'django.contrib.auth.views.password_reset_done'),
-    (r'^reset/(?P<uidb36>[0-9A-Za-z]+)-(?P<token>.+)/$', 'django.contrib.auth.views.password_reset_confirm'),
+    (r'^reset/(?P<uidb36>[0-9A-Za-z]{1,13})-(?P<token>[0-9A-Za-z]{1,13}-[0-9A-Za-z]{1,20})/$', 'django.contrib.auth.views.password_reset_confirm'),
     (r'^reset/done/$', 'django.contrib.auth.views.password_reset_complete'),
 )
 
diff --git a/django/utils/http.py b/django/utils/http.py
index f0b1af9c586dc..2fb60078e568b 100644
--- a/django/utils/http.py
+++ b/django/utils/http.py
@@ -73,8 +73,13 @@ def http_date(epoch_seconds=None):
 
 def base36_to_int(s):
     """
-    Convertd a base 36 string to an integer
+    Converts a base 36 string to an ``int``. To prevent
+    overconsumption of server resources, raises ``ValueError` if the
+    input is longer than 13 base36 digits (13 digits is sufficient to
+    base36-encode any 64-bit integer).
     """
+    if len(s) > 13:
+        raise ValueError("Base36 input too large")
     return int(s, 36)
 
 def int_to_base36(i):