{"id":"CVE-2026-22815","aliases":["GHSA-w2fm-2cpv-w7v5","PYSEC-2026-2094"],"url":"https://o3.security/vulnerability/CVE-2026-22815","summary":"AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers","details":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, insufficient restrictions in header/trailer handling could cause uncapped memory usage. This issue has been patched in version 3.13.4.","published":"2026-04-01T20:08:08.800Z","modified":"2026-08-07T11:50:38.053400485Z","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/0c2e9da51126238a421568eb7c5b53e5b5d17b36","label":"aio-libs/aiohttp@0c2e9da"},"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/2026/22xxx/CVE-2026-22815.json"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-w2fm-2cpv-w7v5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-22815"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/0c2e9da51126238a421568eb7c5b53e5b5d17b36"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:38.053400485Z"}}