The remote host is missing an update to gnupg announced via advisory DSA 1107-1. Evgeny Legerov discovered that gnupg, the GNU privacy guard, a free PGP replacement contains an integer overflow that can cause a segmentation fault and possibly overwrite memory via a large user ID strings. For the old stable distribution (woody) this problem has been fixed in version 1.0.6-4woody6.
For the stable distribution (sarge) this problem has been fixed in version 1.4.1-1.sarge4. For the unstable distribution (sid) this problem has been fixed in version 1.4.3-2. We recommend that you upgrade your gnupg package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201107-1