{"id":"CVE-2025-69229","title":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python","summary":"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 applicat…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-770"],"vendor":"aiohttp","product":"aiohttp","affected":["aiohttp < 3.13.3"],"patched":["aiohttp 3.13.3"],"published":"2026-01-06","updated":"2026-10-11","sourceUpdated":"2026-10-11T20:10:00.200","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-69229","references":[{"url":"https://github.com/aio-libs/aiohttp/commit/4ed97a4e46eaf61bd0f05063245f613469700229","label":"security-advisories@github.com"},{"url":"https://github.com/aio-libs/aiohttp/commit/dc3170b56904bdf814228fae70a5501a42a6c712","label":"security-advisories@github.com"},{"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-g84x-mcqj-x9qq","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-69229"},{"url":"https://github.com/aio-libs/aiohttp"}],"tags":["nvd","osv","pip"],"epss":0.00404,"epssPercentile":0.34521,"aliases":["GHSA-g84x-mcqj-x9qq","PYSEC-2026-1106"],"ecosystem":"pip","ingestedAt":"2026-07-08T18:25:49.671Z","slug":"CVE-2025-69229","body":"## Overview\n\nAIOHTTP 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.\n\n## Affected\n\n- `aiohttp < 3.13.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `aiohttp 3.13.3`\n\n## Package advisory (CVE-2025-69229)\n\nAffected packages:\n\n- `aiohttp < 3.13.3`\n\nPatched in:\n\n- `aiohttp 3.13.3`\n\nSource: https://osv.dev/vulnerability/GHSA-g84x-mcqj-x9qq","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":214054,"id":"CVE-2025-69229","ts":1790807290829,"field":"cvss","old":null,"new":"5.3"}]}