It was discovered that icu, the internal components for Unicode, did not properly sanitise invalid encoded data, which could lead to cross- site scripting attacks. For the stable distribution , this problem has been fixed in version 3.8.1-3+lenny1. For the oldstable distribution , this problem has been fixed in version 3.6-2etch2. For the testing distribution and the unstable distribution , this problem has been fixed in version 4.0.1-1. We recommend that you upgrade your icu packages.