models/metadata.py in the pikepdf package 1.3.0 through 2.9.2 for Python allows XXE when parsing XMP metadata entries.
{
"unresolved_ranges": [
{
"extracted_events": [
{
"last_affected": "32"
},
{
"last_affected": "33"
}
],
"source": "CPE_FIELD",
"vendor_product": "fedoraproject:fedora",
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
]
}
]
}