fix: bump vendored pdf.js to 5.7.284 - #82
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andrey-canon merged 1 commit intoJul 24, 2026
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The previous vendored pdf.js was 1.0.907 (May 2013), four major versions behind upstream and within the range covered by Mozilla's GHSA-wgrm-67xf-hhpq (arbitrary JavaScript execution upon opening a malicious PDF). 5.7.284 is well past the >= 4.2.67 fix line. The replacement comes from Mozilla's prebuilt `pdfjs-5.7.284-legacy-dist.zip` GitHub Release artifact rather than the `pdfjs-dist` npm package because the npm package is library-only -- it ships `pdf.mjs` plus a bare `PDFViewer` component class, but no `viewer.html` / `viewer.mjs` / `viewer.css` / locale files. A full npm integration would mean rewriting the viewer page against the bare component, which is appropriate as a non-security follow-up but not as the fix here. The viewer page (`lms/templates/pdf_viewer.html`) is rewritten as a Mako adaptation of upstream `web/viewer.html`. A `<base href>` makes the viewer's relative asset URLs resolve against the vendored copy. The analytics shim (`lms/static/js/pdf-analytics.js`) is rewritten in vanilla JS against `PDFViewerApplication.eventBus`. Four analytics events (`textbook.pdf.thumbnails.toggled`, `textbook.pdf.thumbnail.navigated`, `textbook.pdf.outline.toggled`, `textbook.pdf.page.scrolled`) no longer fire because the corresponding UI elements were refactored away in pdf.js 4.x's Views Manager redesign. A new `scripts/refresh-pdfjs-vendor.sh` is the tool for future bumps: update PDFJS_VERSION + PDFJS_LEGACY_ZIP_SHA256, re-run, commit. Closes GHSA-mj74-gfq3-2v9f. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Vuln understood. Lets build a image to view it.
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Description
This is a backport that fixes the Vendored pdf.js library Contains a remote Code Execution Vulnerability issue.
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