CVE-2026-111749

UNKNOWN 0.0

AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies

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, 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.

CWE	CWE-565
Vendor	aio-libs
Product	aiohttp
Published	Oct 19, 2026

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Affected Versions

aio-libs / aiohttp

< 3.14.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gx76-c99x-2c96 github.com: https://github.com/aio-libs/aiohttp/commit/6a07c171ef9f3be583e2907dcd1931372efca8d6 github.com: https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4