File CVE-2025-15366-imap-ctrl-chars.patch of Package python.42782
From 7485ee5e2cf81d3e5ad0d9c3be73cecd2ab4eec7 Mon Sep 17 00:00:00 2001
From: Seth Michael Larson <seth@python.org>
Date: Fri, 16 Jan 2026 10:54:09 -0600
Subject: [PATCH 1/2] Add 'test.support' fixture for C0 control characters
---
Lib/imaplib.py | 3 +++
Lib/test/test_imaplib.py | 9 ++++++++-
Misc/NEWS.d/next/Security/2026-01-16-11-41-06.gh-issue-143921.AeCOor.rst | 1 +
3 files changed, 12 insertions(+), 1 deletion(-)
Index: Python-2.7.18/Lib/imaplib.py
===================================================================
--- Python-2.7.18.orig/Lib/imaplib.py 2020-04-19 23:13:39.000000000 +0200
+++ Python-2.7.18/Lib/imaplib.py 2026-02-13 22:03:45.901187184 +0100
@@ -104,6 +104,7 @@
Response_code = re.compile(r'\[(?P<type>[A-Z-]+)( (?P<data>[^\]]*))?\]')
Untagged_response = re.compile(r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?')
Untagged_status = re.compile(r'\* (?P<data>\d+) (?P<type>[A-Z-]+)( (?P<data2>.*))?')
+_control_chars = re.compile(b'[\x00-\x1F\x7F]')
@@ -852,6 +853,8 @@
data = '%s %s' % (tag, name)
for arg in args:
if arg is None: continue
+ if _control_chars.search(arg):
+ raise ValueError("Control characters not allowed in commands")
data = '%s %s' % (data, self._checkquote(arg))
literal = self.literal
Index: Python-2.7.18/Lib/test/test_imaplib.py
===================================================================
--- Python-2.7.18.orig/Lib/test/test_imaplib.py 2020-04-19 23:13:39.000000000 +0200
+++ Python-2.7.18/Lib/test/test_imaplib.py 2026-02-13 22:05:34.894106936 +0100
@@ -10,7 +10,8 @@
import SocketServer
import time
-from test_support import reap_threads, verbose, transient_internet
+from test_support import (reap_threads, verbose, transient_internet,
+ control_characters_c0)
import unittest
try:
@@ -248,6 +249,12 @@
support.run_unittest(*tests)
+ def test_control_characters(self):
+ client, _ = self._setup(SimpleIMAPHandler)
+ for c0 in control_characters_c0():
+ with self.assertRaises(ValueError):
+ client.login('user{}'.format(c0), 'pass')
+
if __name__ == "__main__":
test_main()
Index: Python-2.7.18/Misc/NEWS.d/next/Security/2026-01-16-11-41-06.gh-issue-143921.AeCOor.rst
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ Python-2.7.18/Misc/NEWS.d/next/Security/2026-01-16-11-41-06.gh-issue-143921.AeCOor.rst 2026-02-13 22:01:28.389020838 +0100
@@ -0,0 +1 @@
+Reject control characters in IMAP commands.
