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[2a01:cb00:1331:aa00:a2e4:fb7b:d88:7544]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887c8a546esm11016455e9.5.2026.03.30.23.57.28 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2026 23:57:28 -0700 (PDT) From: Yoann Congal To: openembedded-core@lists.openembedded.org Subject: [OE-core][scarthgap v2 4/6] python3-pyopenssl: Fix CVE-2026-27448 Date: Tue, 31 Mar 2026 08:57:01 +0200 Message-ID: <6349510d2ae9d8f4ad1c52d7356d2359b7bf4826.1774939987.git.yoann.congal@smile.fr> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Tue, 31 Mar 2026 06:57:33 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/234266 From: Vijay Anusuri Pick patch mentioned in NVD [1] https://nvd.nist.gov/vuln/detail/CVE-2026-27448 [2] https://ubuntu.com/security/CVE-2026-27448 Signed-off-by: Vijay Anusuri Signed-off-by: Yoann Congal --- .../python3-pyopenssl/CVE-2026-27448.patch | 124 ++++++++++++++++++ .../python/python3-pyopenssl_24.0.0.bb | 4 + 2 files changed, 128 insertions(+) create mode 100644 meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27448.patch diff --git a/meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27448.patch b/meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27448.patch new file mode 100644 index 00000000000..87f46b4cb0f --- /dev/null +++ b/meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27448.patch @@ -0,0 +1,124 @@ +From d41a814759a9fb49584ca8ab3f7295de49a85aa0 Mon Sep 17 00:00:00 2001 +From: Alex Gaynor +Date: Mon, 16 Feb 2026 21:04:37 -0500 +Subject: [PATCH] Handle exceptions in set_tlsext_servername_callback callbacks + (#1478) + +When the servername callback raises an exception, call sys.excepthook +with the exception info and return SSL_TLSEXT_ERR_ALERT_FATAL to abort +the handshake. Previously, exceptions would propagate uncaught through +the CFFI callback boundary. + +https://claude.ai/code/session_01P7y1XmWkdtC5UcmZwGDvGi + +Co-authored-by: Claude + +Upstream-Status: Backport [https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0] +CVE: CVE-2026-27448 +Signed-off-by: Vijay Anusuri +--- + CHANGELOG.rst | 1 + + src/OpenSSL/SSL.py | 7 ++++++- + tests/test_ssl.py | 50 ++++++++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 57 insertions(+), 1 deletion(-) + +diff --git a/CHANGELOG.rst b/CHANGELOG.rst +index 6e23770..12e60e4 100644 +--- a/CHANGELOG.rst ++++ b/CHANGELOG.rst +@@ -18,6 +18,7 @@ Changes: + + - Added ``OpenSSL.SSL.Connection.get_selected_srtp_profile`` to determine which SRTP profile was negotiated. + `#1279 `_. ++- ``Context.set_tlsext_servername_callback`` now handles exceptions raised in the callback by calling ``sys.excepthook`` and returning a fatal TLS alert. Previously, exceptions were silently swallowed and the handshake would proceed as if the callback had succeeded. + + 23.3.0 (2023-10-25) + ------------------- +diff --git a/src/OpenSSL/SSL.py b/src/OpenSSL/SSL.py +index 4db5240..a6263c4 100644 +--- a/src/OpenSSL/SSL.py ++++ b/src/OpenSSL/SSL.py +@@ -1,5 +1,6 @@ + import os + import socket ++import sys + import typing + from errno import errorcode + from functools import partial, wraps +@@ -1567,7 +1568,11 @@ class Context: + + @wraps(callback) + def wrapper(ssl, alert, arg): +- callback(Connection._reverse_mapping[ssl]) ++ try: ++ callback(Connection._reverse_mapping[ssl]) ++ except Exception: ++ sys.excepthook(*sys.exc_info()) ++ return _lib.SSL_TLSEXT_ERR_ALERT_FATAL + return 0 + + self._tlsext_servername_callback = _ffi.callback( +diff --git a/tests/test_ssl.py b/tests/test_ssl.py +index ca5bf83..55489b9 100644 +--- a/tests/test_ssl.py ++++ b/tests/test_ssl.py +@@ -1855,6 +1855,56 @@ class TestServerNameCallback: + + assert args == [(server, b"foo1.example.com")] + ++ def test_servername_callback_exception( ++ self, monkeypatch: pytest.MonkeyPatch ++ ) -> None: ++ """ ++ When the callback passed to `Context.set_tlsext_servername_callback` ++ raises an exception, ``sys.excepthook`` is called with the exception ++ and the handshake fails with an ``Error``. ++ """ ++ exc = TypeError("server name callback failed") ++ ++ def servername(conn: Connection) -> None: ++ raise exc ++ ++ excepthook_calls: list[ ++ tuple[type[BaseException], BaseException, object] ++ ] = [] ++ ++ def custom_excepthook( ++ exc_type: type[BaseException], ++ exc_value: BaseException, ++ exc_tb: object, ++ ) -> None: ++ excepthook_calls.append((exc_type, exc_value, exc_tb)) ++ ++ context = Context(SSLv23_METHOD) ++ context.set_tlsext_servername_callback(servername) ++ ++ # Necessary to actually accept the connection ++ context.use_privatekey(load_privatekey(FILETYPE_PEM, server_key_pem)) ++ context.use_certificate( ++ load_certificate(FILETYPE_PEM, server_cert_pem) ++ ) ++ ++ # Do a little connection to trigger the logic ++ server = Connection(context, None) ++ server.set_accept_state() ++ ++ client = Connection(Context(SSLv23_METHOD), None) ++ client.set_connect_state() ++ client.set_tlsext_host_name(b"foo1.example.com") ++ ++ monkeypatch.setattr(sys, "excepthook", custom_excepthook) ++ with pytest.raises(Error): ++ interact_in_memory(server, client) ++ ++ assert len(excepthook_calls) == 1 ++ assert excepthook_calls[0][0] is TypeError ++ assert excepthook_calls[0][1] is exc ++ assert excepthook_calls[0][2] is not None ++ + + class TestApplicationLayerProtoNegotiation: + """ +-- +2.43.0 + diff --git a/meta/recipes-devtools/python/python3-pyopenssl_24.0.0.bb b/meta/recipes-devtools/python/python3-pyopenssl_24.0.0.bb index 116f214bfa8..bc0b568a46a 100644 --- a/meta/recipes-devtools/python/python3-pyopenssl_24.0.0.bb +++ b/meta/recipes-devtools/python/python3-pyopenssl_24.0.0.bb @@ -10,6 +10,10 @@ SRC_URI[sha256sum] = "6aa33039a93fffa4563e655b61d11364d01264be8ccb49906101e02a33 PYPI_PACKAGE = "pyOpenSSL" inherit pypi setuptools3 +SRC_URI += " \ + file://CVE-2026-27448.patch \ +" + PACKAGES =+ "${PN}-tests" FILES:${PN}-tests = "${libdir}/${PYTHON_DIR}/site-packages/OpenSSL/test"