{"action":"Upgrade aiohttp to 3.13.4 or later.","affected":[{"fixed":"3.13.4","introduced":"0"}],"component":"aiohttp","cve_ids":["CVE-2026-34518"],"ecosystem":"PyPI","epss":0.00337,"exploited":false,"fixed_versions":["3.13.4"],"ghsa_id":"GHSA-966j-vmvw-g2g9","id":"tcs_01M5KGXFSC70CYWB3H9WSP1J9E","modified_at":"2026-07-13T07:15:20.558859332Z","published_at":"2026-04-01T21:17:00.020Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2100","https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4","https://github.com/aio-libs/aiohttp/commit/5351c980dcec7ad385730efdf4e1f4338b24fdb6","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-966j-vmvw-g2g9"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"PYSEC-2026-2100","url":"https://osv.dev/vulnerability/PYSEC-2026-2100"}],"summary":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, when following redirects to a different origin, aiohttp drops the Authorization header, but ret"}