1 files changed, 3 insertions, 1 deletions
diff --git a/netlib/http.py b/netlib/http.py
index c864f1de..1b03d330 100644
--- a/netlib/http.py
+++ b/netlib/http.py
@@ -18,7 +18,7 @@ def parse_url(url):
 
         Checks that:
             port is an integer
-            host is a valid IDNA-encoded hostname
+            host is a valid IDNA-encoded hostname with no null-bytes
             path is valid ASCII
     """
     scheme, netloc, path, params, query, fragment = urlparse.urlparse(url)
@@ -43,6 +43,8 @@ def parse_url(url):
         host.decode("idna")
     except ValueError:
         return None
+    if "\0" in host:
+        return None
     try:
         path.decode("ascii")
     except ValueError: