A vulnerability has been found and corrected in xmlsec1: A missing check for the recommended minimum length of the truncated form of HMAC-based XML signatures was found in xmlsec1 prior to 1.2.12. An attacker could use this flaw to create a specially-crafted XML file that forges an XML signature, allowing the attacker to bypass authentication that is based on the XML Signature specification . This update fixes this vulnerability.