{"id":"CVE-2025-69229","aliases":["GHSA-g84x-mcqj-x9qq","PYSEC-2026-1106"],"url":"https://o3.security/vulnerability/CVE-2025-69229","summary":"AIOHTTP vulnerable to DoS through chunked messages","details":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.","published":"2026-01-05T23:37:52.955Z","modified":"2026-08-07T11:49:43.633973193Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"aiohttp","fixedVersion":"3.13.3"}],"fix":{"url":"https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229","label":"aio-libs/aiohttp@4ed97a4"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/69xxx/CVE-2025-69229.json"},{"type":"ADVISORY","url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-69229"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229"},{"type":"FIX","url":"https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:49:43.633973193Z"}}