Python Library aiohttp < 3.14.1 Multiple Vulnerabilities

high Nessus Plugin ID 324958

Synopsis

A Python library installed on the remote host is affected by multiple vulnerabilities.

Description

The version of the aiohttp Python library installed on the remote host is prior to 3.14.1. It is, therefore, affected by multiple vulnerabilities:

- Prior to 3.14.1, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to use excessive amounts of memory, potentially leading to DoS. (CVE-2026-54273)

- Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused.
If an application makes multiple requests to the same domain, but with different per-request server_hostname parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check. (CVE-2026-54275)

- Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potentially leading to DoS. (CVE-2026-54277)

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

Solution

Upgrade to aiohttp version 3.14.1 or later.

Plugin Details

Severity: High

ID: 324958

File Name: python_aiohttp_3_14_1.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 7/3/2026

Updated: 7/3/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.71

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS Score Source: CVE-2026-54273

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:aiohttp:aiohttp

Patch Publication Date: 6/15/2026

Vulnerability Publication Date: 6/15/2026

Reference Information

CVE: CVE-2026-54273, CVE-2026-54275, CVE-2026-54277, CVE-2026-54279

IAVA: 2026-A-0636

Detections

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