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Python aiohttp: Prior to 3.14.1, if an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use. (CVE-2026-54274)

0
Medium
VulnerabilityCVE-2026-54274gcveosvubuntu-cve-2026-54274cve-2026-54274ubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-25-10ubuntu-26-10ubuntu-pro-26-04-lts
Published: 06/22/2026 (06/22/2026, 18:16:00 UTC)
Source: GCVE Database
Product: python-aiohttp

Description

Python aiohttp versions prior to 3.14.1 contain a vulnerability where an attacker can send large incomplete websocket frame payloads to bypass usual memory size limits. This can lead to excessive memory consumption causing denial of service. The issue is fixed in version 3.14.1.

CVSS v3.1

Score 7.5high

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected software

Ubuntu:Pro:16.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps-legacy/xenial
Affected versions
=0.17.2-1=0.17.4-1=0.17.4-1build1=0.20.2-1=0.20.2-1ubuntu0.1~esm1
Ubuntu:Pro:18.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/bionic
Affected versions
=2.2.3-1build1=2.2.3-2=2.3.6-1=3.0.1-1=3.0.1-1ubuntu0.1~esm1=3.0.1-1ubuntu0.1~esm4=3.0.1-1ubuntu0.1~esm5=3.0.1-1ubuntu0.1~esm6=3.0.1-1ubuntu0.1~esm7
Ubuntu:Pro:20.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/focal
Affected versions
=3.5.4-1=3.5.4-1build1=3.6.1-1=3.6.2-1=3.6.2-1build1=3.6.2-1ubuntu0.1~esm1=3.6.2-1ubuntu1=3.6.2-1ubuntu1+esm1=3.6.2-1ubuntu1+esm3=3.6.2-1ubuntu1+esm4=3.6.2-1ubuntu1+esm5=3.6.2-1ubuntu1+esm6
Ubuntu:Pro:22.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/jammy
Affected versions
=3.7.4-1=3.7.4-1build2=3.8.1-3=3.8.1-4=3.8.1-4build1=3.8.1-4ubuntu0.2=3.8.1-4ubuntu0.2+esm1=3.8.1-4ubuntu0.2+esm2=3.8.1-4ubuntu0.2+esm3
Ubuntu:Pro:24.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/noble
Affected versions
=3.8.4-1=3.9.1-1=3.9.1-1build1=3.9.1-1ubuntu0.1=3.9.1-1ubuntu0.1+esm1=3.9.1-1ubuntu0.1+esm2=3.9.1-1ubuntu0.1+esm3
Ubuntu:25.10more threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=questing
Affected versions
=3.10.11-1build1=3.11.16-1=3.11.16-1ubuntu0.1
Ubuntu:26.10more threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=stonking
Affected versions
=3.13.3-3ubuntu1=3.14.1-4=3.14.1-5=3.14.3-1
Ubuntu:Pro:26.04:LTSmore threats →ghsa
python-aiohttp
pkg:deb/ubuntu/python-aiohttp?arch=source&distro=esm-apps/resolute
Affected versions
=3.11.16-1=3.13.1-1=3.13.3-3=3.13.3-3ubuntu1=3.13.3-3ubuntu1+esm1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 00:49:51 UTC

Technical Analysis

AIOHTTP, an asynchronous HTTP client/server framework for Python's asyncio, has a vulnerability (CVE-2026-54274) in versions before 3.14.1. Specifically, if an attacker sends large incomplete websocket frame payloads, it may bypass the normal memory size limits imposed by the framework. This flaw can result in increased memory usage, potentially leading to denial of service conditions. The vulnerability is addressed and fixed in aiohttp version 3.14.1.

Potential Impact

The vulnerability allows an attacker to bypass memory usage limits by sending large incomplete websocket frames, which can cause excessive memory consumption and potentially lead to denial of service (DoS) on affected systems running vulnerable aiohttp versions.

Mitigation Recommendations

Upgrade to aiohttp version 3.14.1 or later, where this vulnerability is fixed. No other mitigations are specified or required.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-54274
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ad3f5fd2cdf04f656663fed

Added to database: 10/17/2026, 22:26:05 UTC

Last enriched: 10/18/2026, 00:49:51 UTC

Last updated: 10/18/2026, 00:49:51 UTC

Views: 3

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