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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