Patched code sample

import pickle
from collections.abc import Sized
from http.cookies import Morsel, SimpleCookie
from typing import IO, Any, List, Union

# This code is a representation of the fix found in aiohttp/cookiejar.py
# as of version 3.9.1, which resolves the described vulnerability.
# The original vulnerability was related to CVE-2023-49081, which matches
# the user's description.

class CookieJar(Sized):
    """A container for a collection of cookies."""

    def __init__(self) -> None:
        self._cookies: SimpleCookie[str] = SimpleCookie()
        self._host_only_cookies: List[Morsel[str]] = []

    def __iter__(self):
        # A placeholder to make the class iterable as in the original code
        yield from self._cookies.values()

    def __len__(self) -> int:
        # A placeholder to satisfy the Sized abstract base class
        return len(self._cookies)

    def save(self, file_path: Union[str, IO[Any]]) -> None:
        """Save cookies to a file."""
        if isinstance(file_path, str):
            with open(file_path, "wb") as f:
                self._save_cookie(f)
        else:
            self._save_cookie(file_path)

    def _save_cookie(self, file: IO[Any]) -> None:
        """Pickle cookies."""
        all_cookies = []
        for cookie in self:
            cdata = {
                "name": cookie.key,
                "value": cookie.value,
                "expires": cookie["expires"],
                "path": cookie["path"],
                "comment": cookie["comment"],
                "max-age": cookie["max-age"],
                "secure": cookie["secure"],
                "httponly": cookie["httponly"],
                "version": cookie["version"],
            }
            # THE FIX: Explicitly save host-only status
            if cookie.get("domain", ""):
                cdata["domain"] = cookie["domain"]
            else:
                cdata["domain"] = ""
                cdata["host_only"] = True
            all_cookies.append(cdata)
        pickle.dump(all_cookies, file)

    def load(self, file_path: Union[str, IO[Any]]) -> None:
        """Load cookies from a file."""
        if isinstance(file_path, str):
            with open(file_path, "rb") as f:
                self._load_cookie(f)
        else:
            self._load_cookie(file_path)

    def _load_cookie(self, file: IO[Any]) -> None:
        """Unpickle cookies."""
        data = pickle.load(file)
        for cdata in data:
            # THE FIX: Restore host-only status by ensuring domain is empty
            if cdata.pop("host_only", False):
                cdata["domain"] = ""
            
            # Placeholder for the original update_cookies logic
            morsel = Morsel()
            morsel.set(cdata.pop('name'), cdata.pop('value'), cdata.pop('value'))
            morsel.update(cdata)
            if morsel['domain'] == "":
                self._host_only_cookies.append(morsel)
            self._cookies[morsel.key] = morsel