A denial of service vulnerability has been found in libhtml-parser-perl, a collection of modules to parse HTML in text documents which is used by several other projects like e.g. SpamAssassin. Mark Martinec discovered that the decode_entities function will get stuck in an infinite loop when parsing certain HTML entities with invalid UTF-8 characters. An attacker can use this to perform denial of service attacks by submitting crafted HTML to an application using this functionality. For the oldstable distribution , this problem has been fixed in version 3.55-1+etch1. For the stable distribution , this problem has been fixed in version 3.56-1+lenny1. For the testing and unstable distribution, this problem will be fixed soon. We recommend that you upgrade your libhtml-parser-perl packages.