{"id":"CVE-2025-69229","aliases":["GHSA-g84x-mcqj-x9qq","PYSEC-2026-1106"],"title":"AIOHTTP vulnerable to DoS through chunked messages","summary":"AIOHTTP vulnerable to DoS through chunked messages","severity":"medium","vendor":"aiohttp","product":"aiohttp","ecosystem":"pip","affected":["aiohttp < 3.13.3"],"patched":["aiohttp 3.13.3"],"published":"2026-01-05","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:33.073865205Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-g84x-mcqj-x9qq","references":[{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-69229"},{"url":"https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229"},{"url":"https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712"},{"url":"https://github.com/aio-libs/aiohttp"}],"tags":["osv","pip"],"epss":0.00395,"epssPercentile":0.33575,"ingestedAt":"2026-07-08T18:25:49.671Z","slug":"CVE-2025-69229","body":"## Overview\n\n### Summary\n\nHandling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks.\n\n### Impact\n\nIf 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.\n\n-----\n\nPatch: https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712\nPatch: https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229\n\n## Affected packages\n\n- `aiohttp < 3.13.3`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `aiohttp 3.13.3`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}