JLSEC-2026-676 If a TLS 1.3 client gets neither a PSK (pre shared key) extension nor a KSE (key share extension)...

If a TLS 1.3 client gets neither a PSK pre shared key extension nor a KSE key share extension when connecting to a malicious server, a default predictable buffer gets used for the IKM Input Keying Material value when generating the session master secret. Using a potentially known IKM value when...