{"action":"Upgrade aiohttp to 3.13.4 or later.","affected":[{"fixed":"3.13.4","introduced":"0"}],"component":"aiohttp","cve_ids":["CVE-2026-34525"],"ecosystem":"PyPI","epss":0.00288,"exploited":false,"fixed_versions":["3.13.4"],"ghsa_id":"GHSA-c427-h43c-vf67","id":"tcs_01M5KFC36FGN712WGX3VC6PXED","modified_at":"2026-09-10T03:51:01.505705751Z","published_at":"2026-04-01T21:49:45Z","references":["https://osv.dev/vulnerability/GHSA-c427-h43c-vf67","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-c427-h43c-vf67","https://nvd.nist.gov/vuln/detail/CVE-2026-34525","https://github.com/aio-libs/aiohttp/commit/53e2e6fc58b89c6185be7820bd2c9f40216b3000","https://github.com/aio-libs/aiohttp/commit/e00ca3cca92c465c7913c4beb763a72da9ed8349","https://github.com/aio-libs/aiohttp","https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-c427-h43c-vf67","url":"https://osv.dev/vulnerability/GHSA-c427-h43c-vf67"}],"summary":"AIOHTTP accepts duplicate Host headers"}