Most recent entries from all https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 19:43:52 +0000 CVE-2026-27448 — pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback https://vulnerability.circl.lu/vuln/cve-2026-27448 <p><strong>Affected:</strong> pyca pyopenssl</p> <p>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.</p> <p><strong>Affected:</strong> pyca pyopenssl</p> <p>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.</p> https://vulnerability.circl.lu/vuln/cve-2026-27448