{"id":"CVE-2026-54279","aliases":["GHSA-2fqr-mr3j-6wp8","PYSEC-2026-2112"],"url":"https://o3.security/vulnerability/CVE-2026-54279","summary":"AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence","details":"### Summary\n\nHost-only cookies that are saved with ``CookieJar.save()`` and then restored later with ``CookieJar.load()`` lose their host-only status.\n\n### Impact\n\nHost-only cookies that have been loaded from disk may get sent to subdomains that previously should have been disallowed.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2","published":"2026-06-22T16:32:45.407Z","modified":"2026-08-12T03:51:23.692116445Z","cvss":null,"epss":{"score":0.00279,"percentile":0.20426,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"aiohttp","fixedVersion":"3.14.1"}],"fix":{"url":"https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2","label":"aio-libs/aiohttp@a329a7a"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54279.json"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2fqr-mr3j-6wp8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54279"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2"},{"type":"PACKAGE","url":"https://github.com/aio-libs/aiohttp"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:23.692116445Z"}}