PYSEC-2026-4029 Trestle SSTI in Jinja2 include tags allows arbitrary code execution (Incomplete fix of CVE-2026-46439)

Reporter: Cavan Loughran, Celvex Group Inc. Summary ------- The fix for CVE-2026-46439 3.12.2 / 4.0.3 removed the recursive re-render loop in trestle/core/commands/author/jinja.py rendertemplate, but the custom include tags in trestle/core/jinja/tags.py MDSectionInclude, MDCleanInclude still...