{"action":"Upgrade aiohttp to 3.12.14 or later.","affected":[{"fixed":"3.12.14","introduced":"0"}],"component":"aiohttp","cve_ids":["CVE-2025-53643"],"ecosystem":"PyPI","epss":0.00355,"exploited":false,"fixed_versions":["3.12.14"],"ghsa_id":"GHSA-9548-qrrj-x5pj","id":"tcs_01M5KGQKKR9MFF7JD0DB5D7Z97","modified_at":"2026-07-07T17:46:26.996029094Z","published_at":"2026-07-07T16:02:58.017770Z","references":["https://osv.dev/vulnerability/PYSEC-2026-1104","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-9548-qrrj-x5pj","https://nvd.nist.gov/vuln/detail/CVE-2025-53643","https://github.com/aio-libs/aiohttp/commit/e8d774f635dc6d1cd3174d0e38891da5de0e2b6a","https://github.com/aio-libs/aiohttp","https://pypi.org/project/aiohttp","https://github.com/advisories/GHSA-9548-qrrj-x5pj"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-1104","url":"https://osv.dev/vulnerability/PYSEC-2026-1104"},{"source":"nvd","source_id":"CVE-2025-53643","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53643"}],"summary":"AIOHTTP is vulnerable to HTTP Request/Response Smuggling through incorrect parsing of chunked trailer sections"}