{"action":"Upgrade aiohttp to 3.13.4 or later.","affected":[{"fixed":"3.13.4","introduced":"0"}],"component":"aiohttp","cve_ids":["CVE-2026-34519"],"ecosystem":"PyPI","epss":0.00304,"exploited":false,"fixed_versions":["3.13.4"],"ghsa_id":"GHSA-mwh4-6h8g-pg8w","id":"tcs_01M5KGXFXV1WZ3QZAW2C2AGD0B","modified_at":"2026-07-13T07:15:20.567213669Z","published_at":"2026-04-01T21:17:00.170Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2101","https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4","https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2b","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mwh4-6h8g-pg8w"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"PYSEC-2026-2101","url":"https://osv.dev/vulnerability/PYSEC-2026-2101"}],"summary":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may be able to inject ex"}