python3: fix for CVE-2026-1502

Pick patch from [1] also mentioned at NVD report in [2]

[1] 05ed7ce7ae
[2] https://nvd.nist.gov/vuln/detail/CVE-2026-1502
[3] https://security-tracker.debian.org/tracker/CVE-2026-1502

(From OE-Core rev: fe96d5bee9c45344e98cda9bac85c9bd853d5a7e)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

meta/recipes-devtools/python/python3/CVE-2026-1502.patch

@@ -0,0 +1,113 @@
+From 05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69 Mon Sep 17 00:00:00 2001
+From: Seth Larson <seth@python.org>
+Date: Fri, 10 Apr 2026 10:21:42 -0500
+Subject: [PATCH] gh-146211: Reject CR/LF in HTTP tunnel request headers
+ (#146212)
+
+Co-authored-by: Illia Volochii <illia.volochii@gmail.com>
+
+CVE: CVE-2026-1502
+Upstream-Status: Backport [https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69]
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ Lib/http/client.py                            | 11 ++++-
+ Lib/test/test_httplib.py                      | 45 +++++++++++++++++++
+ ...-03-20-09-29-42.gh-issue-146211.PQVbs7.rst |  2 +
+ 3 files changed, 57 insertions(+), 1 deletion(-)
+ create mode 100644 Misc/NEWS.d/next/Security/2026-03-20-09-29-42.gh-issue-146211.PQVbs7.rst
+
+diff --git a/Lib/http/client.py b/Lib/http/client.py
+index 70451d6..7db4807 100644
+--- a/Lib/http/client.py
++++ b/Lib/http/client.py
+@@ -972,13 +972,22 @@ class HTTPConnection:
+         return ip
+ 
+     def _tunnel(self):
++        if _contains_disallowed_url_pchar_re.search(self._tunnel_host):
++            raise ValueError('Tunnel host can\'t contain control characters %r'
++                             % (self._tunnel_host,))
+         connect = b"CONNECT %s:%d %s\r\n" % (
+             self._wrap_ipv6(self._tunnel_host.encode("idna")),
+             self._tunnel_port,
+             self._http_vsn_str.encode("ascii"))
+         headers = [connect]
+         for header, value in self._tunnel_headers.items():
+-            headers.append(f"{header}: {value}\r\n".encode("latin-1"))
++            header_bytes = header.encode("latin-1")
++            value_bytes = value.encode("latin-1")
++            if not _is_legal_header_name(header_bytes):
++                raise ValueError('Invalid header name %r' % (header_bytes,))
++            if _is_illegal_header_value(value_bytes):
++                raise ValueError('Invalid header value %r' % (value_bytes,))
++            headers.append(b"%s: %s\r\n" % (header_bytes, value_bytes))
+         headers.append(b"\r\n")
+         # Making a single send() call instead of one per line encourages
+         # the host OS to use a more optimal packet size instead of
+diff --git a/Lib/test/test_httplib.py b/Lib/test/test_httplib.py
+index e46dac0..e027d93 100644
+--- a/Lib/test/test_httplib.py
++++ b/Lib/test/test_httplib.py
+@@ -369,6 +369,51 @@ class HeaderTests(TestCase):
+                 with self.assertRaisesRegex(ValueError, 'Invalid header'):
+                     conn.putheader(name, value)
+ 
++    def test_invalid_tunnel_headers(self):
++        cases = (
++            ('Invalid\r\nName', 'ValidValue'),
++            ('Invalid\rName', 'ValidValue'),
++            ('Invalid\nName', 'ValidValue'),
++            ('\r\nInvalidName', 'ValidValue'),
++            ('\rInvalidName', 'ValidValue'),
++            ('\nInvalidName', 'ValidValue'),
++            (' InvalidName', 'ValidValue'),
++            ('\tInvalidName', 'ValidValue'),
++            ('Invalid:Name', 'ValidValue'),
++            (':InvalidName', 'ValidValue'),
++            ('ValidName', 'Invalid\r\nValue'),
++            ('ValidName', 'Invalid\rValue'),
++            ('ValidName', 'Invalid\nValue'),
++            ('ValidName', 'InvalidValue\r\n'),
++            ('ValidName', 'InvalidValue\r'),
++            ('ValidName', 'InvalidValue\n'),
++        )
++        for name, value in cases:
++            with self.subTest((name, value)):
++                conn = client.HTTPConnection('example.com')
++                conn.set_tunnel('tunnel', headers={
++                    name: value
++                })
++                conn.sock = FakeSocket('')
++                with self.assertRaisesRegex(ValueError, 'Invalid header'):
++                    conn._tunnel()  # Called in .connect()
++
++    def test_invalid_tunnel_host(self):
++        cases = (
++            'invalid\r.host',
++            '\ninvalid.host',
++            'invalid.host\r\n',
++            'invalid.host\x00',
++            'invalid host',
++        )
++        for tunnel_host in cases:
++            with self.subTest(tunnel_host):
++                conn = client.HTTPConnection('example.com')
++                conn.set_tunnel(tunnel_host)
++                conn.sock = FakeSocket('')
++                with self.assertRaisesRegex(ValueError, 'Tunnel host can\'t contain control characters'):
++                    conn._tunnel()  # Called in .connect()
++
+     def test_headers_debuglevel(self):
+         body = (
+             b'HTTP/1.1 200 OK\r\n'
+diff --git a/Misc/NEWS.d/next/Security/2026-03-20-09-29-42.gh-issue-146211.PQVbs7.rst b/Misc/NEWS.d/next/Security/2026-03-20-09-29-42.gh-issue-146211.PQVbs7.rst
+new file mode 100644
+index 0000000..4993633
+--- /dev/null
++++ b/Misc/NEWS.d/next/Security/2026-03-20-09-29-42.gh-issue-146211.PQVbs7.rst
+@@ -0,0 +1,2 @@
++Reject CR/LF characters in tunnel request headers for the
++HTTPConnection.set_tunnel() method.
+-- 
+2.50.1
+