File CVE-2025-15282-urllib-ctrl-chars.patch of Package python310

From d6c6f0880dbc6ffd770b859087f4cd749a1d0dbb Mon Sep 17 00:00:00 2001
From: Seth Michael Larson <seth@python.org>
Date: Tue, 20 Jan 2026 14:45:58 -0600
Subject: [PATCH] [3.10] gh-143925: Reject control characters in data: URL
 mediatypes (cherry picked from commit
 f25509e78e8be6ea73c811ac2b8c928c28841b9f) (cherry picked from commit
 2c9c746077d8119b5bcf5142316992e464594946)

Co-authored-by: Seth Michael Larson <seth@python.org>
---
 Lib/test/test_urllib.py                                                  |    7 +++++++
 Lib/urllib/request.py                                                    |    5 +++++
 Misc/NEWS.d/next/Security/2026-01-16-11-51-19.gh-issue-143925.mrtcHW.rst |    1 +
 3 files changed, 13 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Security/2026-01-16-11-51-19.gh-issue-143925.mrtcHW.rst

Index: Python-3.10.20/Lib/test/test_urllib.py
===================================================================
--- Python-3.10.20.orig/Lib/test/test_urllib.py	2026-03-05 19:39:02.061358156 +0100
+++ Python-3.10.20/Lib/test/test_urllib.py	2026-03-05 23:19:43.575732909 +0100
@@ -607,6 +607,13 @@
                     "https://localhost", cafile="/nonexistent/path", context=context
                 )
 
+    def test_invalid_mediatype(self):
+        for c0 in control_characters_c0():
+            self.assertRaises(ValueError,urllib.request.urlopen,
+                              f'data:text/html;{c0},data')
+        for c0 in control_characters_c0():
+            self.assertRaises(ValueError,urllib.request.urlopen,
+                              f'data:text/html{c0};base64,ZGF0YQ==')
 
 class urlopen_DataTests(unittest.TestCase):
     """Test urlopen() opening a data URL."""
Index: Python-3.10.20/Lib/urllib/request.py
===================================================================
--- Python-3.10.20.orig/Lib/urllib/request.py	2026-03-05 19:39:02.551702670 +0100
+++ Python-3.10.20/Lib/urllib/request.py	2026-03-05 23:19:43.576415166 +0100
@@ -1659,6 +1659,11 @@
             raise ValueError(
                 "Control characters not allowed in data: mediatype")
 
+        # Disallow control characters within mediatype.
+        if re.search(r"[\x00-\x1F\x7F]", mediatype):
+            raise ValueError(
+                "Control characters not allowed in data: mediatype")
+
         # even base64 encoded data URLs might be quoted so unquote in any case:
         data = unquote_to_bytes(data)
         if mediatype.endswith(";base64"):
Index: Python-3.10.20/Misc/NEWS.d/next/Security/2026-01-16-11-51-19.gh-issue-143925.mrtcHW.rst
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ Python-3.10.20/Misc/NEWS.d/next/Security/2026-01-16-11-51-19.gh-issue-143925.mrtcHW.rst	2026-03-05 23:19:43.576850667 +0100
@@ -0,0 +1 @@
+Reject control characters in ``data:`` URL media types.