CVE-2026-59881
Published:July 30, 2026
Updated:August 04, 2026
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.
Affected Packages
aiohttp (CONDA):
Affected version(s) >=2.0.7 <3.14.2Fix Suggestion:
Update to version 3.14.2aiohttp (CONDA):
Affected version(s) >=2.0.7 <3.14.2Fix Suggestion:
Update to version 3.14.2https://github.com/aio-libs/aiohttp.git (GITHUB):
Affected version(s) >=v0.1 <v3.14.2Fix Suggestion:
Update to version v3.14.2aiohttp (PYTHON):
Affected version(s) >=0.1 <3.14.2Fix Suggestion:
Update to version 3.14.2aiohttp (PYTHON):
Affected version(s) >=0.1 <3.14.2Fix Suggestion:
Update to version 3.14.2Related Resources (9)
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Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Improper Input Validation
EPSS
Base Score:
0.30