Vulnerability DatabaseCVE-2026-34525
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CVE-2026-34525
Published:April 01, 2026
Updated:April 08, 2026
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, multiple Host headers were allowed in aiohttp. This issue has been patched in version 3.13.4.
Affected Packages
aiohttp (CONDA):
Affected version(s) >=2.0.7 <3.13.4
Fix Suggestion:
Update to version 3.13.4
https://github.com/aio-libs/aiohttp.git (GITHUB):
Affected version(s) >=v0.1 <v3.13.4
Fix Suggestion:
Update to version v3.13.4
aiohttp (PYTHON):
Affected version(s) >=0.1 <3.13.4
Fix Suggestion:
Update to version 3.13.4
Related Resources (6)
https://github.com/aio-libs/aiohttp/commit/53e2e6fc58b89c6185be7820bd2c9f40216b3000
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-c427-h43c-vf67
https://github.com/aio-libs/aiohttp
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
https://nvd.nist.gov/vuln/detail/CVE-2026-34525
https://github.com/aio-libs/aiohttp/commit/e00ca3cca92c465c7913c4beb763a72da9ed8349
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CVSS 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
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-444
Improper Input Validation
CWE-20
EPSS
Base Score:
0.10