Highlights
XML External Entity (XXE): 1 prior fix. Scrutinize any change in this area.
odf/opendocument.py: 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.
XML External Entity (XXE): The XML utility module used standard, vulnerable SAX parser factories, rendering any component utilizing these XML helpers susceptible to XXE and XML entity expansion attacks.
XXE: The primary OpenDocument reader allowed the resolution of external general entities during document loading, exposing the application to local file disclosure and server-side request forgery (SSRF).