{"id":"CVE-2026-111749","aliases":["GHSA-gx76-c99x-2c96"],"url":"https://o3.security/vulnerability/CVE-2026-111749","summary":"AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies","details":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Host-Only scope on an existing parent-domain cookie can be removed by a subdomain. A user who accesses an untrusted subdomain can consequently have host-only protections stripped from cookies, although impact is limited when applications do not reflect those cookies to a browser. This issue is fixed in version 3.14.4.","published":"2026-10-19T17:04:42.374Z","modified":"2026-10-23T10:30:35.331362832Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"aiohttp","fixedVersion":"3.14.4"}],"fix":{"url":"https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6","label":"aio-libs/aiohttp@6a07c17"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111749.json"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6"},{"type":"WEB","url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111749"},{"type":"PACKAGE","url":"https://github.com/aio-libs/aiohttp"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-23T10:30:35.331362832Z"}}