fix: with_dynamic_directory path traversal#9162
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Pull request overview
This PR hardens the with_dynamic_directory ASGI middleware against path traversal attempts when resolving app files from a filesystem directory.
Changes:
- Added path traversal rejection and “must be within directory” checks when resolving dynamic app file paths.
- Added regression tests covering raw, encoded, and nested traversal requests.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
marimo/_server/asgi.py |
Adds directory-containment validation and rejects traversal segments during dynamic file matching. |
tests/_server/test_asgi.py |
Adds a new test validating traversal attempts are blocked (return 404/pass-through). |
akshayka
approved these changes
Apr 13, 2026
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mscolnick
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Jun 30, 2026
…ap (#10015) ## Summary Closes #10012. `DynamicDirectoryMiddleware` resolved the notebook directory's real path once at startup and checked every request against that frozen path. When the directory is reached through a symlink that's atomically re-pointed at runtime (atomic deploys, k8s ConfigMap/Secret mounts, git-sync), the frozen path goes stale and every notebook 404s until the process restarts. Regression from #9162 in v0.23.2. Fix: resolve the directory live in `_is_within_directory` instead of caching it at init. The cache never saved a syscall anyway — `path.resolve()` already runs on every request. The #9162 path-traversal protection is unchanged: both sides are still fully resolved before comparison, so `..` and escaping symlinks are still rejected. <!-- This is an auto-generated description by cubic. --> <a href="https://cubic.dev/pr/marimo-team/marimo/pull/10015?utm_source=github" target="_blank" rel="noopener noreferrer" data-no-image-dialog="true"><picture><source media="(prefers-color-scheme: dark)" srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img alt="Review in cubic" src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a> <!-- End of auto-generated description by cubic. -->
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