{"affected":[{"product":"aiohttp","source":"CNA: GitHub_M","vendor":"aio-libs","versions":[{"status":"affected","version":"< 3.14.4"}]}],"cveId":"CVE-2026-128128","cwes":["CWE-770"],"description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the C WebSocket reader adds a declared frame length to the size of an already buffered partial message using signed 64-bit arithmetic. A length near two to the power of 63 can overflow, allowing the max_msg_size check to pass. A remote peer can send a small non-final fragment followed by an oversized message and cause unbounded memory consumption. The Python WebSocket reader is unaffected. This issue is fixed in version 3.14.4.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.5,"severity":"high","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794601919981,"publishedAt":1794601919981,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/aio-libs/aiohttp/security/advisories/GHSA-3rp8-rxj8-mvjw"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/pull/13415"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/pull/13494"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/commit/8c8906a19f64e52ef6a7d44d65217eb3c5af413f"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/commit/8cfbe9abe5e11b84006a10f9bdf82bf607671dab"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4"}],"remediation":[],"revision":"818a893fdce05fb9113ff1ac0dbc348945119ab46053b0742f5103b7c1de7edf","sources":[{"modifiedAt":1794601919981,"name":"CNA: GitHub_M","retrievedAt":1794604210142,"url":"https://www.cve.org/CVERecord?id=CVE-2026-128128"}],"ssvc":null,"status":"published","title":"AIOHTTP: WebSocket max_msg_size bypass via integer overflow","updatedAt":1794604210142}