Bug 2573468 (CVE-2026-128125) - CVE-2026-128125 aiohttp: aiohttp: Denial of Service via unbounded cookie storage
Summary: CVE-2026-128125 aiohttp: aiohttp: Denial of Service via unbounded cookie storage
Keywords:
Status: NEW
Alias: CVE-2026-128125
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-13 20:31 UTC by OSIDB Bzimport
Modified: 2026-11-13 20:43 UTC (History)
0 users

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Description OSIDB Bzimport 2026-11-13 20:31:47 UTC 
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.
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