OpenSSL remote denial of service vulnerability

Problem Description:
Server or client applications that call the SSL_check_chain()
function during or after a TLS 1.3 handshake may crash due to a NULL
pointer dereference as a result of incorrect handling of the
“signature_algorithms_cert” TLS extension. The crash occurs if an
invalid or unrecognized signature algorithm is received from the
peer.
Impact:
A malicious peer could exploit the NULL pointer dereference crash,
causing a denial of service attack.