CVE-2026-54275 | AIOHTTP is an asynchronous HTTP client/server framework for … | CVSS 2.7 LOW

Description

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.

Metadata

CVE ID: CVE-2026-54275
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-12 17:13 UTC
Published: 2026-06-22 16:34 UTC
Last updated: 2026-06-22 17:27 UTC
Primary CWE: CWE-297
CWE-297: Improper Validation of Certificate with Host Mismat…
Vendor / Product: aio-libs / aiohttp
Sources: cve.org · NVD

Severity & Metrics

2.7 LOW CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
aio-libs	aiohttp	—	< 3.14.1

Weakness (CWE)

CWE	Source	Description
CWE-297	cna	CWE-297: Improper Validation of Certificate with Host Mismatch

CVSS scores (1)

Score	Severity	Version	Source	Vector
2.7	LOW	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

References (1)

https://github.com/aio-libs/aiohttp/security/advisories/GHSA-4m7w-qmgq-4wj5 https://github.com/aio-libs/aiohttp/security/advisories/GHSA-4m7w-qmgq-4wj5