https://github.com/python/cpython/commit/6b3d4eae81efc4e78b922e7d5f4eefbff521af25
commit: 6b3d4eae81efc4e78b922e7d5f4eefbff521af25
branch: 3.13
author: Serhiy Storchaka <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-08-21T08:41:10Z
summary:
[3.13] gh-156099: Fix a crash when deleting SSLContext.keylog_filename
(GH-156103) (GH-156150)
The setter did not check the value for NULL and passed it to Py_fopen().
(cherry picked from commit 5ebd4860d3746eaeb890c947799508e1ed4936fe)
files:
A Misc/NEWS.d/next/Library/2026-08-20-12-00-00.gh-issue-156099.Kp4vRt.rst
M Lib/test/test_ssl.py
M Modules/_ssl/debughelpers.c
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index db67090930b0136..aacc912b684e5cf 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -5146,6 +5146,12 @@ def test_keylog_defaults(self):
with self.assertRaises(TypeError):
ctx.keylog_filename = 1
+ ctx.keylog_filename = os_helper.TESTFN
+ with self.assertRaisesRegex(AttributeError, 'cannot be deleted'):
+ del ctx.keylog_filename
+ # a failed deletion does not change the value
+ self.assertEqual(ctx.keylog_filename, os_helper.TESTFN)
+
@requires_keylog
def test_keylog_filename(self):
self.addCleanup(os_helper.unlink, os_helper.TESTFN)
diff --git
a/Misc/NEWS.d/next/Library/2026-08-20-12-00-00.gh-issue-156099.Kp4vRt.rst
b/Misc/NEWS.d/next/Library/2026-08-20-12-00-00.gh-issue-156099.Kp4vRt.rst
new file mode 100644
index 000000000000000..1092a5a53785635
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-08-20-12-00-00.gh-issue-156099.Kp4vRt.rst
@@ -0,0 +1,3 @@
+Fix a crash when deleting the ``keylog_filename`` attribute of
+:class:`ssl.SSLContext`.
+It now raises :exc:`AttributeError`.
diff --git a/Modules/_ssl/debughelpers.c b/Modules/_ssl/debughelpers.c
index 9ee4b9eb11cf487..9861f3b46ac0058 100644
--- a/Modules/_ssl/debughelpers.c
+++ b/Modules/_ssl/debughelpers.c
@@ -166,6 +166,12 @@ static int
_PySSLContext_set_keylog_filename(PySSLContext *self, PyObject *arg, void *c) {
FILE *fp;
+ if (arg == NULL) {
+ PyErr_Format(PyExc_AttributeError,
+ "attribute 'keylog_filename' of '%.100s' objects "
+ "cannot be deleted", Py_TYPE(self)->tp_name);
+ return -1;
+ }
#if defined(MS_WINDOWS) && defined(_DEBUG)
PyErr_SetString(PyExc_NotImplementedError,
"set_keylog_filename: unavailable on Windows debug build");
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