| Package | Affected versions | Patched versions |
|---|---|---|
| tornado | < 6.5.5 | 6.5.5 |
| tornado | < 6.5.5 | 6.5.5 |
Values passed to the domain, path, and samesite arguments of RequestHandler.set_cookie were not completely validated in versions of Tornado prior to 6.5.5. In particular, semicolons would be allowed, which could be used to inject attacker-controlled values for other cookie attributes.
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