CVE-2026-34517 LOW

CVE-2026-34517: AIOHTTP: Late size enforcement for non-file multipart fields causes memory DoS

Vendor Aio-Libs
Product aiohttp
Weakness CWE-770 · Uncontrolled resource consumption
Published April 1, 2026
Last update April 2, 2026
View on NVD All CVEs

CVSS base score

2.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

What the vulnerability does

01Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, for some multipart form fields, aiohttp read the entire field into memory before checking client_max_size. This issue has been patched in version 3.13.4.

Key dates

02Disclosure timeline

April 1, 2026 CVE published
April 2, 2026 Record updated