The Mojolicious module before 7.66 for Perl may leak cookies in certain situations related to multiple similar cookies for the same domain. This affects Mojo::UserAgent::CookieJar.
https://metacpan.org/dist/Mojolicious/changes
https://github.com/mojolicious/mojo/pull/1192
https://github.com/mojolicious/mojo/issues/1185
https://github.com/mojolicious/mojo/commit/c16a56a9d6575ddc53d15e76d58f0ebcb0eeb149