The Site pulled pdf.js 3.11.174 from cdnjs with no integrity attribute, and the
policy trusted the whole of cdnjs.cloudflare.com for both script-src and
worker-src. Anything that host served would have executed, and a customer
measuring a PDF sheet depended on it being reachable.
Vendor both files instead of pinning a hash: it removes the dependency rather
than constraining it, and lets the policy name only 'self'. Provenance and
SHA-256 digests are recorded in local/static/vendor/README.md, verified on
download against the SRI digests cdnjs publishes for that release.
cdnjs is now absent from script-src, worker-src and connect-src in both gateway
templates. Workers are 'self' plus blob:, which the Site needs for the worker it
constructs itself.
Verified in a browser against the running stack: pdf.js loads from /vendor/, the
blob worker starts, and a real seven-page PDF parses with no CSP violation. Both
browser suites and the full integration suite pass.
The version is deliberately unchanged. 3.11.174 is old, but its known eval path
is already closed by isEvalSupported:false, and upgrading is an API change that
needs its own testing rather than riding along with this.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
