Greg Hudson discovered integer overflow flaws in the PAC parsing in
krb5, the MIT implementation of Kerberos, which may result in remote
code execution (in a KDC, kadmin, or GSS or Kerberos application server process), information exposure (to a cross-realm KDC acting
maliciously), or denial of service (KDC or kadmind process crash).
For the stable distribution (bullseye), this problem has been fixed in