fix: prevent path traversal via directory prefix collision in _joinDirectoryName#1062
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tunnckoCore merged 1 commit intonode-formidable:masterfrom Feb 18, 2026
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…rectoryName The startsWith check compared string prefixes, not filesystem paths. When uploadDir lacks a trailing separator (the default), sibling directories sharing the same prefix bypass the check. Use path.resolve + path.sep to ensure the resolved path is inside the upload directory, not just sharing a string prefix. Fixes node-formidable#1061
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thanks, will check. |
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Fixes #1061
The
startsWithcheck in_joinDirectoryName()compared string prefixes, not filesystem paths. WhenuploadDirlacks a trailing separator (the default —os.tmpdir()never includes one), sibling directories sharing the same prefix bypass the traversal check.Changes:
path.resolve()to normalize both paths before comparisonpath.septo the resolved directory, ensuring the path is inside the directoryTests added: