fix(export): block path traversal in resourceResolver#462
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Sanitize relative image paths during export to prevent file exfiltration outside the document directory. Resolves and normalizes paths before use, rejecting any that escape the base directory. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
srcpaths inresolveRelativePath()to prevent path traversal (../) from exfiltrating files outside the document directory during exportbaseDir; returnnull(treated as missing) when traversal is detected%2F) before joining to block encoded traversal variantsCloses #455
Test plan
resolveRelativePathblocks../../.ssh/id_rsa, blocks encoded..%2F..%2F, allowssubdir/../photo.png(stays within base)resolveResourcestreats traversal images as missing, never callscopyFilepnpm check:allpasses (lint + coverage + build)🤖 Generated with Claude Code