CVE-2026-39835: golang.org/x/crypto is vulnerable to invoking server panic during CheckHostKey/Authenticate flow

(updated )

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

References

Code Behaviors & Features

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