Highlights
XXE: 2 prior fixes. Scrutinize any change in this area.
ezvcard/io/xml/XCardDocument.java: most-fixed (1 issue). Treat as high-risk during review.
2 high-severity fixes in this history; regressions here are high-impact.
Recurring patterns
The bug types that recur here, drawn from past fixes, not open vulnerabilities.
XXE: XML transformer created without disabling external DTD/schema/stylesheets allows XXE during serialization, potentially leaking local files or causing SSRF.
XXE: DocumentBuilderFactory used for parsing without disabling external entities, DOCTYPE, or XInclude permits XXE when reading untrusted XCard XML.