CVE-2025-66578 robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation

xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Versions 3.1.3 contain an authentication bypass vulnerability due to a flaw in the libxml2 canonicalization process during document transformation. When libxml2’s canonicalization is invoked on an invalid XML...