The remote host is missing an update to freetype announced via advisory DSA 2294-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202294-1

It was discovered that insufficient input saniting in Freetype's code to parse Type1 could lead to the execution of arbitrary code. For the oldstable distribution (lenny), this problem has been fixed in version 2.3.7-2+lenny6. For the stable distribution (squeeze), this problem has been fixed in version 2.4.2-2.1+squeeze1. For the unstable distribution (sid), this problem has been fixed in version 2.4.6-1. We recommend that you upgrade your freetype packages.