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Fixed an issue where instances of :class:`ssl.SSLSocket` were vulnerable to
a bypass of the TLS handshake and included protections (like certificate
verification) and treating sent unencrypted data as if it were
post-handshake TLS encrypted data.  Security issue reported as
`CVE-2023-40217
<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-40217>`_ by
Aapo Oksman. Patch by Gregory P. Smith.