VDB-372743 · CVE-2026-54273 · GHSA-4fvr-rgm6-gqmc

aio-libs aiohttp up to 3.14.0 allocation of resources

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	2.59

Summaryinfo

A vulnerability was found in aio-libs aiohttp up to 3.14.0. It has been rated as problematic. This affects an unknown function. The manipulation leads to allocation of resources. This vulnerability is listed as CVE-2026-54273. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in aio-libs aiohttp up to 3.14.0. It has been rated as problematic. This issue affects an unknown function. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. 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. This vulnerability is fixed in 3.14.1.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-54273 since 06/12/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 3.14.1 eliminates this vulnerability. Applying the patch dfdfa9d5aad5d21f91c79fb2ceeba0f8046cb6cf is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38317). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

aio-libs

Name

aiohttp

Version

License

open-source

Website

Product: https://github.com/aio-libs/aiohttp/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: aiohttp 3.14.1
Patch: dfdfa9d5aad5d21f91c79fb2ceeba0f8046cb6cf

Timelineinfo

06/12/2026 CVE reserved
06/22/2026 +10 days Advisory disclosed
06/22/2026 +0 days VulDB entry created
06/23/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-4fvr-rgm6-gqmc
Status: Confirmed

CVE: CVE-2026-54273 (🔒)
GCVE (CVE): GCVE-0-2026-54273
GCVE (VulDB): GCVE-100-372743
EUVD: 🔒

Entryinfo

Created: 06/22/2026 20:55
Updated: 06/23/2026 02:26
Changes: 06/22/2026 20:55 (69), 06/23/2026 02:26 (1)
Complete: 🔍
Cache ID: 216::103