CVE-2026-111749
Low
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Host-Only scope on an existing parent-domain cookie can be removed by a subdomain. A user who accesses an untrusted subdomain can consequently have host-only protections stripped from cookies, although impact is limited when applications do not reflect those cookies to a browser. This issue is fixed in version 3.14.4.
SeverityLow
CVSS2.3
Exploit probability—
ProductAiohttp
PublishedOct 19, 2026
First seenOct 19, 2026
Weakness typeCWE-565CWE-565
How to fix
Update
- aiohttp3.14.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| aiohttpPyPI | v < 3.14.4 | 3.14.4 |
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