CVE-2026-128125
AIOHTTP: Unbounded cookie storage in client CookieJar
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Set-Cookie parsing treats unrecognized name=value attributes as additional cookies, while CookieJar does not limit the number of cookies stored or sent. A malicious server can make an aiohttp client accumulate a very large cookie set, consume memory and CPU repeatedly across redirects, and construct an excessively large Cookie header for later requests to the same domain. This issue is fixed in version 3.14.4.
| CWE | CWE-1325 |
| Vendor | aio-libs |
| Product | aiohttp |
| Published | Nov 13, 2026 |
| Last Updated | Nov 13, 2026 |
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Affected Versions
aio-libs / aiohttp
< 3.14.4
References
github.com: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-5pv8-vvhc-h7jv github.com: https://github.com/aio-libs/aiohttp/pull/13930 github.com: https://github.com/aio-libs/aiohttp/pull/13942 github.com: https://github.com/aio-libs/aiohttp/commit/6963ee0befec1502b6bb7b4db6c72d044c08f4fa github.com: https://github.com/aio-libs/aiohttp/commit/b1f6c87b2bd3bd80f2b6c22ff46e11d00921e412 github.com: https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4