CVE-2026-34517

Updated on 01 Apr 2026

Severity

2.7 Low severity

Details

CVSS score
2.7
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Overview

About vulnerability

Summary

For some multipart form fields, aiohttp read the entire field into memory before checking client_max_size.

Impact

If an application uses Request.post() an attacker can send a specially crafted multipart request to force significant temporary memory allocation even when the request is ultimately rejected.


Patch: https://github.com/aio-libs/aiohttp/commit/cbb774f38330563422ca0c413a71021d7b944145

Details

Affected packages:
aiohttp @ 3.8.5.post7+tuxcare (+5 more)

Fixes