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[2a01:cb00:1331:aa00:a2e4:fb7b:d88:7544]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887c8a546esm11016455e9.5.2026.03.30.23.57.29 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2026 23:57:29 -0700 (PDT) From: Yoann Congal To: openembedded-core@lists.openembedded.org Subject: [OE-core][scarthgap v2 5/6] python3-pyopenssl: Fix CVE-2026-27459 Date: Tue, 31 Mar 2026 08:57:02 +0200 Message-ID: <94c6f16933b9ff4c4a2ea46be1e3fc5f2979a49d.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/234267 From: Vijay Anusuri Pick patch mentioned in NVD [1] https://nvd.nist.gov/vuln/detail/CVE-2026-27459 [2] https://ubuntu.com/security/CVE-2026-27459 Signed-off-by: Vijay Anusuri Signed-off-by: Yoann Congal --- .../python3-pyopenssl/CVE-2026-27459.patch | 109 ++++++++++++++++++ .../python/python3-pyopenssl_24.0.0.bb | 1 + 2 files changed, 110 insertions(+) create mode 100644 meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27459.patch diff --git a/meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27459.patch b/meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27459.patch new file mode 100644 index 00000000000..f75540f96e0 --- /dev/null +++ b/meta/recipes-devtools/python/python3-pyopenssl/CVE-2026-27459.patch @@ -0,0 +1,109 @@ +From 57f09bb4bb051d3bc2a1abd36e9525313d5cd408 Mon Sep 17 00:00:00 2001 +From: Alex Gaynor +Date: Wed, 18 Feb 2026 07:46:15 -0500 +Subject: [PATCH] Fix buffer overflow in DTLS cookie generation callback + (#1479) + +The cookie generate callback copied user-returned bytes into a +fixed-size native buffer without enforcing a maximum length. A +callback returning more than DTLS1_COOKIE_LENGTH bytes would overflow +the OpenSSL-provided buffer, corrupting adjacent memory. + +Co-authored-by: Claude Opus 4.6 + +Upstream-Status: Backport [https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408] +CVE: CVE-2026-27459 +Signed-off-by: Vijay Anusuri +--- + CHANGELOG.rst | 1 + + src/OpenSSL/SSL.py | 7 +++++++ + tests/test_ssl.py | 38 ++++++++++++++++++++++++++++++++++++++ + 3 files changed, 46 insertions(+) + +diff --git a/CHANGELOG.rst b/CHANGELOG.rst +index 12e60e4..6041fdc 100644 +--- a/CHANGELOG.rst ++++ b/CHANGELOG.rst +@@ -16,6 +16,7 @@ Deprecations: + Changes: + ^^^^^^^^ + ++- Properly raise an error if a DTLS cookie callback returned a cookie longer than ``DTLS1_COOKIE_LENGTH`` bytes. Previously this would result in a buffer-overflow. + - 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. +diff --git a/src/OpenSSL/SSL.py b/src/OpenSSL/SSL.py +index a6263c4..2e4da78 100644 +--- a/src/OpenSSL/SSL.py ++++ b/src/OpenSSL/SSL.py +@@ -691,11 +691,18 @@ class _CookieGenerateCallbackHelper(_CallbackExceptionHelper): + def __init__(self, callback): + _CallbackExceptionHelper.__init__(self) + ++ max_cookie_len = getattr(_lib, "DTLS1_COOKIE_LENGTH", 255) ++ + @wraps(callback) + def wrapper(ssl, out, outlen): + try: + conn = Connection._reverse_mapping[ssl] + cookie = callback(conn) ++ if len(cookie) > max_cookie_len: ++ raise ValueError( ++ f"Cookie too long (got {len(cookie)} bytes, " ++ f"max {max_cookie_len})" ++ ) + out[0 : len(cookie)] = cookie + outlen[0] = len(cookie) + return 1 +diff --git a/tests/test_ssl.py b/tests/test_ssl.py +index 55489b9..683e368 100644 +--- a/tests/test_ssl.py ++++ b/tests/test_ssl.py +@@ -4560,6 +4560,44 @@ class TestDTLS: + def test_it_works_with_srtp(self): + self._test_handshake_and_data(srtp_profile=b"SRTP_AES128_CM_SHA1_80") + ++ def test_cookie_generate_too_long(self) -> None: ++ s_ctx = Context(DTLS_METHOD) ++ ++ def generate_cookie(ssl: Connection) -> bytes: ++ return b"\x00" * 256 ++ ++ def verify_cookie(ssl: Connection, cookie: bytes) -> bool: ++ return True ++ ++ s_ctx.set_cookie_generate_callback(generate_cookie) ++ s_ctx.set_cookie_verify_callback(verify_cookie) ++ s_ctx.use_privatekey(load_privatekey(FILETYPE_PEM, server_key_pem)) ++ s_ctx.use_certificate(load_certificate(FILETYPE_PEM, server_cert_pem)) ++ s_ctx.set_options(OP_NO_QUERY_MTU) ++ s = Connection(s_ctx) ++ s.set_accept_state() ++ ++ c_ctx = Context(DTLS_METHOD) ++ c_ctx.set_options(OP_NO_QUERY_MTU) ++ c = Connection(c_ctx) ++ c.set_connect_state() ++ ++ c.set_ciphertext_mtu(1500) ++ s.set_ciphertext_mtu(1500) ++ ++ # Client sends ClientHello ++ try: ++ c.do_handshake() ++ except SSL.WantReadError: ++ pass ++ chunk = c.bio_read(self.LARGE_BUFFER) ++ s.bio_write(chunk) ++ ++ # Server tries DTLSv1_listen, which triggers cookie generation. ++ # The oversized cookie should raise ValueError. ++ with pytest.raises(ValueError, match="Cookie too long"): ++ s.DTLSv1_listen() ++ + def test_timeout(self, monkeypatch): + c_ctx = Context(DTLS_METHOD) + c = Connection(c_ctx) +-- +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 bc0b568a46a..94a70aa17d1 100644 --- a/meta/recipes-devtools/python/python3-pyopenssl_24.0.0.bb +++ b/meta/recipes-devtools/python/python3-pyopenssl_24.0.0.bb @@ -12,6 +12,7 @@ inherit pypi setuptools3 SRC_URI += " \ file://CVE-2026-27448.patch \ + file://CVE-2026-27459.patch \ " PACKAGES =+ "${PN}-tests"