By default OpenSSL has max_cert_list=100 KB, which is enough for classic certificates. But this value might be insufficient for post-quantum certificate chains when using algorithms with large signatures or in case of long chain length. This value can be changed by SSL_CTX_set_max_cert_list() call in OpenSSL, but pure nginx apparently does not provide API for this.
By default OpenSSL has
max_cert_list=100 KB, which is enough for classic certificates. But this value might be insufficient for post-quantum certificate chains when using algorithms with large signatures or in case of long chain length. This value can be changed bySSL_CTX_set_max_cert_list()call in OpenSSL, but pure nginx apparently does not provide API for this.