CVE-2026-34517 PUBLISHED

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

Assigner: GitHub_M
Reserved: 30.03.2026 Published: 01.04.2026 Updated: 01.04.2026

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.

Metrics

CVSS 4.0

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
CVSS Score: 2.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	aio-libs
Product	aiohttp
Versions	Version < 3.13.4 is affected

References

Problem Types

CWE-770: Allocation of Resources Without Limits or Throttling CWE