python
diff --git a/‎Lib/http/server.py
Lines changed: 3 additions & 3 deletions b/‎Lib/http/server.py
Lines changed: 3 additions & 3 deletions
diff --git a/‎Lib/test/test_httpservers.py
Lines changed: 19 additions & 0 deletions b/‎Lib/test/test_httpservers.py
Lines changed: 19 additions & 0 deletions
diff --git a/‎Misc/NEWS
Lines changed: 4 additions & 0 deletions b/‎Misc/NEWS
Lines changed: 4 additions & 0 deletions
@@ -774,9 +774,9 @@ def translate_path(self, path):
         words = filter(None, words)
         path = os.getcwd()
         for word in words:
-            drive, word = os.path.splitdrive(word)
-            head, word = os.path.split(word)
+            if os.path.dirname(word) or word in (os.curdir, os.pardir):
+                # Ignore components that are not a simple file/directory name
+                continue
             path = os.path.join(path, word)
         if trailing_slash:
             path += '/'
 
@@ -12,6 +12,7 @@
 import sys
 import re
 import base64
+import ntpath
 import shutil
 import urllib.parse
 import html
@@ -918,6 +919,24 @@ def test_start_with_double_slash(self):
         path = self.handler.translate_path('//filename?foo=bar')
         self.assertEqual(path, self.translated)
 
+    def test_windows_colon(self):
+        with support.swap_attr(server.os, 'path', ntpath):
+            path = self.handler.translate_path('c:c:c:foo/filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
+            path = self.handler.translate_path('\\c:../filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
+            path = self.handler.translate_path('c:\\c:..\\foo/filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
+            path = self.handler.translate_path('c:c:foo\\c:c:bar/filename')
+            path = path.replace(ntpath.sep, os.sep)
+            self.assertEqual(path, self.translated)
+
 
 class MiscTestCase(unittest.TestCase):
     def test_all(self):
 
@@ -107,6 +107,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #26657: Fix directory traversal vulnerability with http.server on
+  Windows.  This fixes a regression that was introduced in 3.3.4rc1 and
+  3.4.0rc1.  Based on patch by Philipp Hagemeister.
+
 - Issue #26717: Stop encoding Latin-1-ized WSGI paths with UTF-8.  Patch by
   Anthony Sottile.