The remote host is missing an update to x-face-el announced via advisory DSA 340-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20340-1

NOTE: due to a combination of administrative problems, this advisory was erroneously released with the identifier 'DSA-338-1'. DSA-338-1 correctly refers to an earlier advisory regarding proftpd. x-face-el, a decoder for images included inline in X-Face email headers, does not take appropriate security precautions when creating temporary files. This bug could potentially be exploited to overwrite arbitrary files with the privileges of the user running Emacs and x-face-el, potentially with contents supplied by the attacker. For the stable distribution (woody) this problem has been fixed in version 1.3.6.19-1woody1. For the unstable distribution (sid) this problem has been fixed in version 1.3.6.23-1. We recommend that you update your x-face-el package.