<svg><image href=https://…> and <use xlink:href=…> survived the gate (only
javascript: schemes were stripped from svg hrefs), and bare-string
image-set("https://…" 1x) dodged the url()-shaped neutralizer. Remote
svg hrefs rewrite to '#' (entity-decode-aware, unclosed-svg smuggle
closed) and remote image-set args neutralize to url(#). Local fragments,
local image-set, and plain <a> links pinned intact. 12 new rows, red-first.
Three live vectors found by the ship review army, all red-first tested:
unquoted style attributes skipped the remote-url neutralizer entirely;
CSS ident/string escapes (@\69mport, url(\68ttps://…)) defeated the
literal-match patterns Chromium happily decodes; and HTML entities in
style attribute values (https) decoded to fetchable schemes before
CSS parsing. Style-attr values are now entity-decoded in one browser-
faithful pass, escape-bearing at-rules and function tokens are dropped
fail-closed, and output is re-encoded double-quoted. 21 new test rows.
With --allow-network off, the sanitizer stripped script/iframe/link but let
Chromium fetch remote resources at print time through four raw-HTML vectors:
<style> @import (any form), remote url() in <style> blocks and inline style
attributes (incl. protocol-relative //), srcset with a remote candidate
(Chromium prefers srcset over the inlined src), and remote src/poster on
video/audio/source/track. All neutralized at the sanitizer; remote <img src>
is deliberately left for the image inliner so its blocked-remote placeholder
still fires, and url() mentions in prose/code spans stay untouched.
Fork's test suite ported verbatim (12 cases incl. the end-to-end render
assertion), verified RED against the old sanitizer.
Ported from time-attack/gstack (GStack 2).
Co-authored-by: Sina Matian <sina@time-attack.dev>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Garry Tan