{"id":"CVE-2026-111749","title":"AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies","summary":"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 consequent…","severity":"low","cvss":2.3,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-565"],"vendor":"aio-libs","product":"aiohttp","affected":["aiohttp < 3.14.4"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-22T20:52:28.753978Z"},"published":"2026-10-19","updated":"2026-10-22","sourceUpdated":"2026-10-22T20:52:37.188Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111749","references":[{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96","label":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96"},{"url":"https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6","label":"https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6"},{"url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4","label":"https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111749"},{"url":"https://github.com/aio-libs/aiohttp"},{"url":"https://github.com/advisories/GHSA-gx76-c99x-2c96"}],"tags":["cve.org","osv","pip","ghsa"],"epss":0.00384,"epssPercentile":0.32263,"aliases":["GHSA-gx76-c99x-2c96"],"ecosystem":"pip","patched":["aiohttp 3.14.4"],"ingestedAt":"2026-10-19T17:33:42.452Z","slug":"CVE-2026-111749","body":"## Overview\n\nAIOHTTP 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.\n\n## Affected\n\n- `aiohttp < 3.14.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-111749)\n\nAffected packages:\n\n- `aiohttp < 3.14.4`\n\nPatched in:\n\n- `aiohttp 3.14.4`\n\nSource: https://osv.dev/vulnerability/GHSA-gx76-c99x-2c96","depth":"sunlit","depthScore":13,"depthScoreParts":{"impact":12.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}