{"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_01M5KGXF63MCMWA3QDYC3ME4BC","modified_at":"2026-07-13T07:15:20.606847597Z","published_at":"2026-04-01T21:16:59.723Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2098","https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4","https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"PYSEC-2026-2098","url":"https://osv.dev/vulnerability/PYSEC-2026-2098"}],"summary":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, a response with an excessive number of multipart headers may be allowed to use more memory than"}