Tornado before 6.5.8 Cookie Attribute Injection via Capitalized kwargs

{
                    "vendor": "tornadoweb",
                    "product": "tornado",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "version": "6.5.5",
                            "lessThan": "6.5.8",
                            "status": "affected"
                        },
                        {
                            "versionType": "semver",
                            "version": "6.5.8",
                            "status": "unaffected"
                        }
                    ],
                    "packageURL": "pkg:pypi/tornado"
                }