{"id":"CVE-2026-47265","aliases":["GHSA-hg6j-4rv6-33pg","PYSEC-2026-2105"],"url":"https://o3.security/vulnerability/CVE-2026-47265","summary":"AIOHTTP vulnerable to cross-origin redirect with per-request cookies","details":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the `cookies` parameter on requests are sent after following a cross-origin redirect. If a developer uses the `cookies` parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade, using a `Cookie` header in the `headers` parameter is not vulnerable.","published":"2026-06-02T18:32:50.926Z","modified":"2026-08-12T03:51:33.967511834Z","cvss":null,"epss":{"score":0.0015,"percentile":0.04707,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"aiohttp","fixedVersion":"3.14.0"}],"fix":{"url":"https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478","label":"aio-libs/aiohttp@f54c408"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47265.json"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-hg6j-4rv6-33pg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47265"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:33.967511834Z"}}