GitHub Advisoryadvisory · PyPI

GHSA-gx76-c99x-2c96 AIOHTTP: Cookie from subdomain can remove Host-Only Scope from existing cookies

LOW Published 2026-10-20 Modified 2026-10-20 Official page ↗
Aliases
CVE-2026-111749
Ecosystem
PyPI
Packages
aiohttp
Severity
Low
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Weaknesses
CWE-565
Reviewed
2026-10-20

Affected packages

• PyPI aiohttp: < 3.14.4 → fixed in 3.14.4

Description

Summary A subdomain can remove the Host-Only flag from an existing cookie to a parent domain. Impact A user accessing untrusted subdomains could see their Host-Only protections stripped from cookies. Given most usecases won't reflect these cookies to a browser, the impact is limited.

Related

Alias · CVE (1)

  • CVE-2026-111749 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. vulnerability

Weakness · CWE (1)

  • CWE-565 Reliance on Cookies without Validation and Integrity Checking weakness

References