Effect: Cookie attribute injection via domain, path, and name fields in @effect/platform makeCookie()
The name, domain, and path fields of makeCookie() were validated with a regex that allows ;, the attribute separator in Set-Cookie headers. Because serializeCookie() writes those fields verbatim, a caller who passes untrusted input into any of them can append arbitrary attributes to the header. For example, a domain of "legit.com; Domain=.parent.tld" serializes to session=token; Domain=legit.com; Domain=.parent.tld. RFC 6265 §5.3 takes the last occurrence, so the injected domain wins and …