krb5: unbounded recursion via an ASN.1-encoded Kerberos message (CVE-2020-28196)
MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.
Reference:
https://nvd.nist.gov/vuln/detail/CVE-2020-28196
Patch:
https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfd