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Python aiohttp: Prior to 3.14.1, no limit was present on the number of pipelined requests that could be queued. (CVE-2026-54273)

0
Medium
VulnerabilityCVE-2026-54273gcveosvubuntu-cve-2026-54273cve-2026-54273ubuntu-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 have no limit on the number of pipelined HTTP requests that can be queued. This lack of limit allows an attacker to potentially consume excessive memory, leading to a denial of service (DoS). The issue is resolved 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, 00:49:56 UTC

Technical Analysis

The aiohttp asynchronous HTTP client/server framework for Python versions before 3.14.1 does not impose a limit on the number of pipelined requests queued. This can be exploited by an attacker to cause excessive memory consumption, potentially resulting in a denial of service condition. The vulnerability is identified as CVE-2026-54273 and has a CVSS 3.1 base score of 7.5, indicating a medium severity. The vulnerability is fixed in aiohttp version 3.14.1.

Potential Impact

An attacker can exploit the unlimited queuing of pipelined requests to consume excessive memory resources on the affected system, potentially causing a denial of service (DoS) by exhausting available memory.

Mitigation Recommendations

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

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-54273
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: 6ad3f5fd2cdf04f656663fee

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

Last enriched: 10/18/2026, 00:49:56 UTC

Last updated: 10/18/2026, 00:49:56 UTC

Views: 3

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