In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters.
GHSA-78cv-mqj4-43f7 — Tornado has incomplete validation of cookie attributes
GHSA-fqwm-6jpj-5wxc — Tornado has cookie attribute injection via .RequestHandler.set_cookie
PYSEC-2026-2287 — In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked