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Python Cryptographic Authority: Fail-Open in set_tlsext_servername_callback on pyopenssl via unhandled exceptions leads to security bypass

🗓️ 16 Feb 2026 22:41:43Reported by uv3dobleType 
hackerone
 hackerone
🔗 hackerone.com👁 6 Views

PyOpenSSL swallows exceptions in set_tlsext_servername_callback, bypassing server name indication.

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20 Mar 2026 16:10Current
5.8Medium risk
Vulners AI Score5.8
6