[openssl 1.1.1n] ... SSL server send 4 certificates ... the 3rd one has NULL algor in its public key.

[Viktor Dukhovni]

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On Tue, Mar 07, 2023 at 08:17:57PM +0000, Ma Zhenhua wrote:

> I've attached the cert in DER format. Thanks.

The certificate looks perfectly ordinary, are there any corresponding
certificates (same subject DN in your CAfile or CApath)?

Perhaps you're inadvertently freeing the public key which belongs to the
certificate object.

-- 
    Viktor.