Multipart Request Processing Vulnerability in AIOHTTP by Aio-libs
CVE-2026-111066

8.2HIGH

Key Information:

Vendor

Aio-libs

Status
Aiohttp
Vendor
CVE Published:
19 October 2026

What is CVE-2026-111066?

AIOHTTP, an asynchronous HTTP client/server framework for asyncio and Python, has a vulnerability in its multipart request processing that can lead to the retention of an unbounded number of open file descriptors. This occurs when an unauthenticated attacker sends specially crafted multipart requests while using Request.post(), potentially leading to exhaustion of file descriptors. The issue has been addressed in version 3.14.4, which users are advised to upgrade to in order to mitigate this risk.

Affected Version(s)

aiohttp >= 2.0.0, < 3.14.4

References

https://github.com/aio-libs/aiohttp/security/advisories/G...
x_refsource_CONFIRM
https://github.com/aio-libs/aiohttp/commit/2d94633b7f1b4c...
x_refsource_MISC
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
x_refsource_MISC

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.