package/python3: add upstream security patch for CVE-2026-11940

https://seclists.org/oss-sec/2026/q2/1006
https://www.cve.org/CVERecord?id=CVE-2026-11940
https://github.com/python/cpython/pull/151559

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Fiona Klute <fiona.klute@gmx.de>

package/python3/0011-3.14-gh-151558-Fix-symlink-escape-via-tarfile-hardli.patch

@@ -0,0 +1,83 @@
+From 79c06bd5c6afa3c440d50faf7ee1b147c8832b4c Mon Sep 17 00:00:00 2001
+From: "Miss Islington (bot)"
+ <31488909+miss-islington@users.noreply.github.com>
+Date: Tue, 23 Jun 2026 15:58:47 +0200
+Subject: [PATCH] [3.14] gh-151558: Fix symlink escape via `tarfile`
+ hardlink-extraction fallback (GH-151559)
+
+(cherry picked from commit 27dd970bf6b17ebca7c8ed486a40ab043ed7af8f)
+
+Co-authored-by: Stan Ulbrych <stan@python.org>
+
+Upstream: https://github.com/python/cpython/commit/79c06bd5c6afa3c440d50faf7ee1b147c8832b4c
+CVE: CVE-2026-11940
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ Lib/tarfile.py                                |  3 +++
+ Lib/test/test_tarfile.py                      | 24 +++++++++++++++++++
+ ...-06-10-13-08-19.gh-issue-151558.mL74i2.rst |  3 +++
+ 3 files changed, 30 insertions(+)
+ create mode 100644 Misc/NEWS.d/next/Security/2026-06-10-13-08-19.gh-issue-151558.mL74i2.rst
+
+diff --git a/Lib/tarfile.py b/Lib/tarfile.py
+index 39b1cd6514c..399f906efdf 100644
+--- a/Lib/tarfile.py
++++ b/Lib/tarfile.py
+@@ -2784,6 +2784,9 @@ def makelink_with_filter(self, tarinfo, targetpath,
+                     "makelink_with_filter: if filter_function is not None, "
+                     + "extraction_root must also not be None")
+             try:
++                filter_function(
++                    unfiltered.replace(name=tarinfo.name, deep=False),
++                    extraction_root)
+                 filtered = filter_function(unfiltered, extraction_root)
+             except _FILTER_ERRORS as cause:
+                 raise LinkFallbackError(tarinfo, unfiltered.name) from cause
+diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
+index 8503024a690..045377d620c 100644
+--- a/Lib/test/test_tarfile.py
++++ b/Lib/test/test_tarfile.py
+@@ -4344,6 +4344,30 @@ def test_sneaky_hardlink_fallback(self):
+                     self.expect_file("boom", symlink_to='../../link_here')
+                     self.expect_file("c", symlink_to='b')
+ 
++    @symlink_test
++    def test_sneaky_hardlink_fallback_deep(self):
++        # (CVE-2026-11940)
++        with ArchiveMaker() as arc:
++            arc.add("a/b/s", symlink_to=os.path.join("..", "escape"))
++            arc.add("s", hardlink_to=os.path.join("a", "b", "s"))
++
++        with self.check_context(arc.open(), 'data'):
++            e = self.expect_exception(
++                tarfile.LinkFallbackError,
++                "link 's' would be extracted as a copy of "
++                + "'a/b/s', which was rejected")
++            self.assertIsInstance(e.__cause__,
++                                  tarfile.LinkOutsideDestinationError)
++
++        for filter in 'tar', 'fully_trusted':
++            with self.subTest(filter), self.check_context(arc.open(), filter):
++                if not os_helper.can_symlink():
++                    self.expect_file("a/")
++                    self.expect_file("a/b/")
++                else:
++                    self.expect_file("a/b/s", symlink_to=os.path.join('..', 'escape'))
++                    self.expect_file("s", symlink_to=os.path.join('..', 'escape'))
++
+     @symlink_test
+     def test_exfiltration_via_symlink(self):
+         # (CVE-2025-4138)
+diff --git a/Misc/NEWS.d/next/Security/2026-06-10-13-08-19.gh-issue-151558.mL74i2.rst b/Misc/NEWS.d/next/Security/2026-06-10-13-08-19.gh-issue-151558.mL74i2.rst
+new file mode 100644
+index 00000000000..74459d5680e
+--- /dev/null
++++ b/Misc/NEWS.d/next/Security/2026-06-10-13-08-19.gh-issue-151558.mL74i2.rst
+@@ -0,0 +1,3 @@
++Fixed an vulnerability in the :mod:`tarfile` ``data`` and ``tar`` extraction
++filters where crafted archives could create a symlink pointing outside the
++destination directory. This was a bypass of :cve:`2025-4330`.
+-- 
+2.47.3
+

package/python3/python3.mk

@@ -13,6 +13,9 @@ PYTHON3_LICENSE_FILES = LICENSE
 PYTHON3_CPE_ID_VENDOR = python
 PYTHON3_CPE_ID_PRODUCT = python
 
+# 0011-3.14-gh-151558-Fix-symlink-escape-via-tarfile-hardli.patch
+PYTHON3_IGNORE_CVES += CVE-2026-11940
+
 # This host Python is installed in $(HOST_DIR), as it is needed when
 # cross-compiling third-party Python modules.