WS-2026-0119
Published:October 07, 2026
Updated:October 13, 2026
aiohttp 3.9.0b1 through 3.14.3: the pure-Python HTTP request parser (used when the C extension is unavailable or AIOHTTP_NO_EXTENSIONS is set) applies the HEAD empty-body rule to requests, ignoring the body of a HEAD request and enabling request smuggling behind a proxy. (GHSA-pqxq-w44r-73xw)
Affected Packages
aiohttp (CONDA):
Affected version(s) >=3.9.0 <3.14.4Fix Suggestion:
Update to version 3.14.4https://github.com/aio-libs/aiohttp.git (GITHUB):
Affected version(s) >=v3.9.0b1 <v3.14.4Fix Suggestion:
Update to version v3.14.4aiohttp (PYTHON):
Affected version(s) >=3.9.0b1 <3.14.4Fix Suggestion:
Update to version 3.14.4Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')