{"action":"Upgrade aiohttp to 3.13.4 or later.","affected":[{"fixed":"3.13.4","introduced":"0"}],"component":"aiohttp","cve_ids":["CVE-2026-34516"],"ecosystem":"PyPI","epss":0.00609,"exploited":false,"fixed_versions":["3.13.4"],"ghsa_id":"GHSA-m5qp-6w8w-w647","id":"tcs_01M5KFQAYFMF76QEYAC13WYR00","modified_at":"2026-09-10T03:51:02.372876858Z","published_at":"2026-04-01T21:43:07Z","references":["https://osv.dev/vulnerability/GHSA-m5qp-6w8w-w647","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647","https://nvd.nist.gov/vuln/detail/CVE-2026-34516","https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f","https://github.com/aio-libs/aiohttp","https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-m5qp-6w8w-w647","url":"https://osv.dev/vulnerability/GHSA-m5qp-6w8w-w647"}],"summary":"AIOHTTP has a Multipart Header Size Bypass"}