CVE-2026-54275 Details
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.
A vulnerability exists in AIOHTTP versions through 3.14.0, allowing the server_hostname TLS SNI check to be bypassed when an existing connection is reused. This issue arises when an application makes multiple requests to the same domain with different server_hostname parameters. The later requests may incorrectly succeed by reusing the existing connection, bypassing the SNI check that should have blocked them. This vulnerability is addressed in AIOHTTP version 3.14.1.
Users can upgrade to AIOHTTP version 3.14.1 or later to address this vulnerability. If an immediate upgrade is not possible, consider disabling keep_alive to prevent connection reuse between requests with different server_hostname values.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/aio-libs/aiohttp/security/advisories/GHSA-4m7w-qmgq-4wj5 | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-297 | Improper Validation of Certificate with Host Mismatch | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| aiohttp aiohttp | < 3.14.1 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 26, 2026 | Initial Analysis | [email protected] |
| Jun 22, 2026 | CVE Modified | CISA-ADP |
| Jun 22, 2026 | New CVE Received | [email protected] |