CVE-2026-27448 | BDVDB-2026-320906 Detail

Description#

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.

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Exploit#

History#

1. Version 12026-03-17Record published in the CVE List.
2. Version 22026-03-18Most recent update recorded in the CVE List.