CVE-2026-111749
Published:October 19, 2026
Updated:October 20, 2026
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.
Affected Packages
aiohttp (CONDA):
Affected version(s) >=3.8.4 <3.14.4Fix Suggestion:
Update to version 3.14.4https://github.com/aio-libs/aiohttp.git (GITHUB):
Affected version(s) >=v3.8.4 <v3.14.4Fix Suggestion:
Update to version v3.14.4aiohttp (PYTHON):
Affected version(s) >=3.8.4 <3.14.4Fix Suggestion:
Update to version 3.14.4aiohttp (PYTHON):
Affected version(s) >=0.1 <3.14.4Fix Suggestion:
Update to version 3.14.4Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Reliance on Cookies without Validation and Integrity Checking
EPSS
Base Score:
0.29