aiohttp < 3.14.3 Out-of-bounds Read DoS

high Nessus Plugin ID 333343

Synopsis

A Python library installed on the remote host is affected by a denial of service vulnerability.

Description

The version of aiohttp installed on the remote host is prior to 3.14.3. It is, therefore, affected by a denial of service vulnerability:

- AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3. (CVE-2026-69244)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to aiohttp version 3.14.3 or later.

Plugin Details

Severity: High

ID: 333343

File Name: aiohttp_3_14_3.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 8/7/2026

Updated: 8/7/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.88

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-69244

CVSS v3

Risk Factor: High

Base Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v4

Risk Factor: High

Base Score: 7.1

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:aiohttp:aiohttp

Patch Publication Date: 8/3/2026

Vulnerability Publication Date: 8/3/2026

Reference Information

CVE: CVE-2026-69244

IAVA: 2026-A-0818

Detections

Analytics