Peter Valchev discovered an error in expat, an XML parsing C library, when parsing certain UTF-8 sequences, which can be exploited to crash an application using the library. For the old stable distribution , this problem has been fixed in version 1.95.8-3.4+etch1. For the stable distribution , this problem has been fixed in version 2.0.1-4+lenny1. For the testing distribution and the unstable distribution , this problem will be fixed soon. We recommend that you upgrade your expat packages.