File CVE-2025-15367-poplib-ctrl-chars.patch of Package python39.42784
From b6f733b285b1c4f27dacb5c2e1f292c914e8b933 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/poplib.py | 2 ++
Lib/test/test_poplib.py | 8 ++++++++
Misc/NEWS.d/next/Security/2026-01-16-11-43-47.gh-issue-143923.DuytMe.rst | 1 +
3 files changed, 11 insertions(+)
Index: Python-3.9.25/Lib/poplib.py
===================================================================
--- Python-3.9.25.orig/Lib/poplib.py 2026-02-12 01:46:21.368357815 +0100
+++ Python-3.9.25/Lib/poplib.py 2026-02-12 01:50:00.747401124 +0100
@@ -122,6 +122,8 @@
def _putcmd(self, line):
if self._debugging: print('*cmd*', repr(line))
line = bytes(line, self.encoding)
+ if re.search(b'[\x00-\x1F\x7F]', line):
+ raise ValueError('Control characters not allowed in commands')
self._putline(line)
Index: Python-3.9.25/Lib/test/test_poplib.py
===================================================================
--- Python-3.9.25.orig/Lib/test/test_poplib.py 2026-02-12 01:46:22.912552087 +0100
+++ Python-3.9.25/Lib/test/test_poplib.py 2026-02-12 01:50:20.733385664 +0100
@@ -16,6 +16,7 @@
from test import support as test_support
from test.support import hashlib_helper
from test.support import socket_helper
+from test.support import control_characters_c0
HOST = socket_helper.HOST
PORT = 0
@@ -360,6 +361,13 @@
self.assertIsNone(self.client.sock)
self.assertIsNone(self.client.file)
+ def test_control_characters(self):
+ for c0 in control_characters_c0():
+ with self.assertRaises(ValueError):
+ self.client.user(f'user{c0}')
+ with self.assertRaises(ValueError):
+ self.client.pass_(f'{c0}pass')
+
@requires_ssl
def test_stls_capa(self):
capa = self.client.capa()
Index: Python-3.9.25/Misc/NEWS.d/next/Security/2026-01-16-11-43-47.gh-issue-143923.DuytMe.rst
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ Python-3.9.25/Misc/NEWS.d/next/Security/2026-01-16-11-43-47.gh-issue-143923.DuytMe.rst 2026-02-12 01:50:00.748230248 +0100
@@ -0,0 +1 @@
+Reject control characters in POP3 commands.
