[slt2021]

I was not able to find whether openssh can be exploited with this CVE by presenting malicious client auth certificate.

would be glad if someone could clarify whether openssh has this vulnerability?

[formerly_proven]

OpenSSH doesn't support X.509 certificates.

[xorcist]

Nor does it call any SSL-related function.

OpenSSH only links to OpenSSL for the cryptographic primitives. SSH and SSL are different protocols.