GHSA-2fqr-mr3j-6wp8

aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence

Source: GitHub Advisory Database (reviewed) Low CVE-2026-54279

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	aiohttp	< 3.14.1	3.14.1

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary 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

References

External links from the advisory. They lead to third-party sites.

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2fqr-mr3j-6wp8 web
https://nvd.nist.gov/vuln/detail/CVE-2026-54279 advisory
https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2 web
https://github.com/aio-libs/aiohttp package
https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp/PYSEC-2026-2112.yaml web