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Technology
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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| dio | pub | < 5.0.0 | 5.0.0 |
The vulnerability stems from missing validation of the HTTP method string before constructing requests. The patch introduced the _isValidToken validation check in _transformData, which was absent in vulnerable versions. Since _transformData is the entry point for request processing and directly used the unvalidated options.method parameter, its lack of validation made it the vulnerable entry point for CRLF injection.
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