aio-libs aiohttp up to 3.14.0 certificate host validation

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k2.48

Summaryinfo

A vulnerability classified as problematic has been found in aio-libs aiohttp up to 3.14.0. This vulnerability affects unknown code. The manipulation leads to certificate host validation. This vulnerability is traded as CVE-2026-54275. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in aio-libs aiohttp up to 3.14.0 and classified as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a certificate host validation vulnerability. Using CWE to declare the problem leads to CWE-297. The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host. Impacted is integrity. The summary by CVE is:

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

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-54275 since 06/12/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

Upgrading to version 3.14.1 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

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: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate host validation
CWE: CWE-297 / CWE-295 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

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

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: aiohttp 3.14.1

Timelineinfo

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

Sourcesinfo

Product: github.com

Advisory: GHSA-4m7w-qmgq-4wj5
Status: Confirmed

CVE: CVE-2026-54275 (🔒)
GCVE (CVE): GCVE-0-2026-54275
GCVE (VulDB): GCVE-100-372749

Entryinfo

Created: 06/22/2026 20:57
Changes: 06/22/2026 20:57 (68)
Complete: 🔍
Cache ID: 216::103

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