bind -- denial of service vulnerability

ISC reports:

A very uncommon combination of zone data has been found
that triggers a bug in BIND, with the result that named
will exit with a “REQUIRE” failure in name.c when validating
the data returned in answer to a recursive query.
A recursive resolver that is performing DNSSEC validation
can be deliberately terminated by any attacker who can
cause a query to be performed against a maliciously
constructed zone. This will result in a denial of
service to clients who rely on that resolver.