{"id":"CVE-2026-34516","aliases":["GHSA-m5qp-6w8w-w647","PYSEC-2026-2098"],"url":"https://o3.security/vulnerability/CVE-2026-34516","summary":"AIOHTTP: Multipart Header Size Bypass","details":"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 intended, potentially allowing a DoS vulnerability. This issue has been patched in version 3.13.4.","published":"2026-04-01T20:13:04.893Z","modified":"2026-08-07T11:48:54.109035255Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"aiohttp","fixedVersion":"3.13.4"}],"fix":{"url":"https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f","label":"aio-libs/aiohttp@8a74257"},"references":[{"type":"WEB","url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34516.json"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m5qp-6w8w-w647"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34516"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/8a74257b3804c9aac0bf644af93070f68f6c5a6f"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:48:54.109035255Z"}}