diff --git a/zulip_bots/zulip_bots/bots/github_detail/github_detail.py b/zulip_bots/zulip_bots/bots/github_detail/github_detail.py
index e304866..42c5bca 100644
--- a/zulip_bots/zulip_bots/bots/github_detail/github_detail.py
+++ b/zulip_bots/zulip_bots/bots/github_detail/github_detail.py
@@ -74,9 +74,15 @@ class GithubHandler(object):
             return
 
         # Capture owner, repo, id
-        issue_prs = re.finditer(
-            self.HANDLE_MESSAGE_REGEX, message['content'])
+        issue_prs = list(re.finditer(
+            self.HANDLE_MESSAGE_REGEX, message['content']))
         bot_messages = []
+        if len(issue_prs) > 5:
+            # We limit to 5 requests to prevent denial-of-service
+            bot_message = 'Please ask for <=5 links in any one request'
+            bot_handler.send_reply(message, bot_message)
+            return
+
         for issue_pr in issue_prs:
             owner, repo = self.get_owner_and_repo(issue_pr)
             if owner and repo:
diff --git a/zulip_bots/zulip_bots/bots/github_detail/test_github_detail.py b/zulip_bots/zulip_bots/bots/github_detail/test_github_detail.py
index 325d718..645a8f7 100755
--- a/zulip_bots/zulip_bots/bots/github_detail/test_github_detail.py
+++ b/zulip_bots/zulip_bots/bots/github_detail/test_github_detail.py
@@ -81,3 +81,11 @@ class TestGithubDetailBot(BotTestCase):
 
         with self.mock_config_info(self.mock_config):
             self.verify_reply(request, bot_response)
+
+    def test_too_many_request(self) -> None:
+        request = 'zulip/zulip#1 zulip/zulip#1 zulip/zulip#1 zulip/zulip#1 '\
+                  'zulip/zulip#1 zulip/zulip#1 zulip/zulip#1 zulip/zulip#1'
+        bot_response = 'Please ask for <=5 links in any one request'
+
+        with self.mock_config_info(self.mock_config):
+            self.verify_reply(request, bot_response)