system
Describe <CVE-2019-20398>.
user
What is <CVE-2019-20398>?
assistant
A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash..