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Security Bulletin: pyOpenSSL TLS SNI Callback Exception Handling Flaw Allows Security Bypass

🗓️ 04 May 2026 12:18:07Reported by IBMType 
ibm
 ibm🔗 www.ibm.com👁 6 Views

Security bulletin: pyOpenSSL TLS SNI callback flaw could bypass security before 26.0.0; 26.0.0 rejects.

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Rows per page
Vulners
Node
ibmpowervcMatch2.2.1.2
OR
ibmpowervcMatch2.3.0
OR
ibmpowervcMatch2.3.1
OR
ibmpowervcMatch2.3.2

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04 May 2026 12:18Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.19.8
CVSS 49.2
EPSS0.00043
SSVC
pyOpenSSLtls servername callbackunhandled exceptionsecurity bypassbuffer overflowcookie generate callbackPowerVC
6