{"id":"CVE-2026-54279","aliases":["GHSA-2fqr-mr3j-6wp8","PYSEC-2026-2112"],"title":"aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence","summary":"aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence","severity":"low","vendor":"aiohttp","product":"aiohttp","ecosystem":"pip","affected":["aiohttp < 3.14.1"],"patched":["aiohttp 3.14.1"],"published":"2026-06-15","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:51:07.471021274Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-2fqr-mr3j-6wp8","references":[{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2fqr-mr3j-6wp8"},{"url":"https://github.com/aio-libs/aiohttp"},{"url":"https://github.com/advisories/GHSA-2fqr-mr3j-6wp8"}],"tags":["osv","pip","ghsa"],"epss":0.00493,"epssPercentile":0.39785,"cwe":["CWE-665"],"ingestedAt":"2026-07-07T15:41:58.694Z","slug":"CVE-2026-54279","body":"## Overview\n\n### 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\n\n## Affected packages\n\n- `aiohttp < 3.14.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `aiohttp 3.14.1`","depth":"sunlit","depthScore":14,"depthScoreParts":{"impact":13.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}