node-stream-zip's extract(null, root) writes each entry to path.join(root,
entry.name) without neutralising '../', so a crafted archive entry named
'../../uploads/logos/evil.svg' escaped the target dir and overwrote arbitrary
files (logos, .env, route files → RCE on source deploys). Requires admin with
archives.restore.
Adds assertZipEntriesWithin() to utils/safePath.js — a lexical containment
check run on the entry list BEFORE extract() — and guards both extract sinks:
adminArchives.js (the reported route) and picpeakImportService.js (the sibling
.picpeak import, same sink). Adds unit tests for traversal, absolute-path, and
sibling-prefix entries.
Paul Nothaft