TI-2026-39175 Aliases CVE-2026-54275 GHSA-4m7w-qmgq-4wj5

AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections

LOW 14CWE-297Published 2026-06-22 · Updated 2026-06-22

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: Low · Low · None
Fix status: Partial Red Hat: 10 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0047 40th percentileScored 2026-11-07

Fix Partial aiohttp (aio-libs): 3.14.1aiohttp (PyPI): 3.14.1Red Hat: 10 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
aio-libs	aiohttp	before 3.14.1	3.14.1	Patch available	CNA
—	aiohttp (PyPI)	before 3.14.1	3.14.1	Patch available	GHSA-4m7w-qmgq-4wj5

aiohttp Vendoraio-libs Affected before 3.14.1 Fixed in 3.14.1 Patch available CNA
aiohttp (PyPI) Vendor— Affected before 3.14.1 Fixed in 3.14.1 Patch available GHSA-4m7w-qmgq-4wj5

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:aiohttp:aiohttp::::::::	before 3.14.1	Vulnerable	Aiohttp

cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:* Versions before 3.14.1 Vulnerable ·Aiohttp

Remediation

Fix · CNA aiohttp (aio-libs) Fixed in 3.14.1
Fix · GHSA-4m7w-qmgq-4wj5 aiohttp (PyPI) Fixed in 3.14.1 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Exploit Intelligence	Affected	No fix planned: Out of support scope
Migration Toolkit for Applications 8	Affected	No fix yet: Fix deferred
OpenShift Lightspeed	Affected	No fix yet: Fix deferred
Red Hat AI Inference Server	Affected	No fix yet: Fix deferred
Red Hat Ansible Automation Platform 2	Affected	No fix yet: Fix deferred
Red Hat Ansible Automation Platform Ansible Core 2	Affected	No fix yet: Fix deferred
Red Hat Discovery 2	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	No fix yet: Fix deferred
Red Hat Satellite 6	Affected	No fix yet: Fix deferred

Not affected: 4 products

Red Hat Ansible Automation Platform Ansible Core 2
Red Hat Hardened Images
Red Hat Satellite 6
Red Hat Update Infrastructure 4 for Cloud Providers

Timeline

2026-10-02 Threatist record created from CVE-2026-54275
2026-10-03 Alias added: GHSA-4m7w-qmgq-4wj5

References

Advisory 1

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

Other 1

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

TI-2025-38826 aiomysql allows arbitrary access to client files through vulnerability of a malicious MySQL server CVSS 4.0HIGH 8.2
TI-2024-15436 aiohttp.web.static(follow_symlinks=True) is vulnerable to directory traversal CVSS 3.1HIGH 7.5
TI-2023-25769 Request smuggling in aiohttp CVSS 3.1HIGH 7.5
TI-2023-18906 aiohttp vulnerable to HTTP request smuggling CVSS 3.1HIGH 7.5
TI-2023-26746 aiohttp's ClientSession is vulnerable to CRLF injection via version CVSS 3.1HIGH 7.2
TI-2026-66145 Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction CVSS 3.1MEDIUM 5.3

See all 59 →

Sources

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