Host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status.
Host-only cookies that have been loaded from disk may get sent to subdomains that previously should have been disallowed.
Patch: https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2
{
"github_reviewed": true,
"github_reviewed_at": "2026-06-15T20:08:51Z",
"nvd_published_at": null,
"severity": "LOW",
"cwe_ids": [
"CWE-665"
]
}