popfile - missing input sanitising

It has been discovered that popfile, a bayesian mail classifier, can
be forced into a crash through malformed character sets within email
messages, which allows denial of service.

The old stable distribution (woody) does not contain popfile packages.

For the stable distribution (sarge) this problem has been fixed in
version 0.22.2-2sarge1.

For the unstable distribution (sid) this problem has been fixed in
version 0.22.4-1.

We recommend that you upgrade your popfile package.