Double free vulnerability in the init_ctx_reselect function in the
SPNEGO initiator in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5
(aka krb5) 1.10.x through 1.12.x before 1.12.2 allows remote attackers
to cause a denial of service (memory corruption) or possibly execute
arbitrary code via network traffic that appears to come from an
intended acceptor, but specifies a security mechanism different from
the one proposed by the initiator.
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