models/metadata.py in the pikepdf package 1.3.0 through 2.9.2 for Python allows XXE when parsing XMP metadata entries.
{
"cwe_ids": [
"CWE-611"
],
"github_reviewed": true,
"github_reviewed_at": "2021-04-19T21:54:20Z",
"severity": "HIGH",
"nvd_published_at": "2021-04-01T20:15:00Z"
}