It was discovered that incorrect pointer handling in the purple library, an internal component of the multi-protocol instant messaging client Pidgin, could lead to denial of service or the execution of arbitrary code through malformed contact requests. For the stable distribution , this problem has been fixed in version 2.4.3-4lenny5. For the unstable distribution , this problem has been fixed in version 2.6.3-1. We recommend that you upgrade your pidgin package.