v0.3.0 makes the untrusted upload path refuse ordinary documents. Measured on
both doors under PRESET_USER_UPLOAD: one ordinary markdown image reaches
fail_secure, one ordinary link/autolink/refdef reaches quarantine_review, and
only a document with no external references persists.
Root cause is three independent defects that compound. Severity tracks
construct type rather than URL shape, so every external image is HIGH when the
exfiltration primitive is actually a URL that carries data outward. The
quarantine floor fires on any finding at all, a premise that broke once every
link became a finding. And the false-positive corpus could not have caught
either: it holds no markdown links or images, asserts only under
PRESET_TRUSTED_SOURCE where everything warns anyway, and runs _scan_input, so
the output gate where active_content lives is never exercised by it.
Both code changes are required together -- verified that fixing severity alone
still quarantines via the floor, and fixing the floor alone still fail-secures
on a HIGH image.
Records the version reasoning too: 0.3.1 is honest as a patch because the
lexicon carries no LOW/INFO patterns (40 high, 22 medium, 21 critical) and no
other detector emits LOW, so raising the floor to MEDIUM+ is a no-op for every
finding that existed before 0.3.0. The new middle preset stays out of this
release; it is additive API and belongs in 0.4.0.
Kjell Tore Guttormsen
da7421e6c8