{"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_01M5KFRXCSFBJKZAGKJFM9TRE1","modified_at":"2026-09-10T03:50:44.819886754Z","published_at":"2026-04-01T21:48:24Z","references":["https://osv.dev/vulnerability/GHSA-mwh4-6h8g-pg8w","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mwh4-6h8g-pg8w","https://nvd.nist.gov/vuln/detail/CVE-2026-34519","https://github.com/aio-libs/aiohttp/commit/53b35a2f8869c37a133e60bf1a82a1c01642ba2b","https://github.com/aio-libs/aiohttp","https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-mwh4-6h8g-pg8w","url":"https://osv.dev/vulnerability/GHSA-mwh4-6h8g-pg8w"},{"source":"nvd","source_id":"CVE-2026-34519","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34519"}],"summary":"AIOHTTP has HTTP response splitting via \\r in reason phrase"}