AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status. This vulnerability is fixed in 3.14.1.
PUBLISHED5.2CWE-665
AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
Problem type
Affected products
aio-libs
aiohttp
< 3.14.1 - AFFECTED
References
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2fqr-mr3j-6wp8
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2fqr-mr3j-6wp8
https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2
https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2
GitHub Security Advisories
GHSA-2fqr-mr3j-6wp8
aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
https://github.com/advisories/GHSA-2fqr-mr3j-6wp8Summary
Host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status.
Impact
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
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-54279Click to expand
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"dateUpdated": "2026-06-22T17:40:23.923Z",
"dateReserved": "2026-06-12T17:13:32.280Z",
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