libxslt: libxml2: Heap Use-After-Free in libxslt caused by atype corruption in xmlAttrPtr

A flaw was found in libxslt where the attribute type, atype, flags are modified in a way that corrupts internal memory management. When XSLT functions, such as the key process, result in tree fragments, this corruption prevents the proper cleanup of ID attributes. As a result, the system may acce...