github.com
https://github.com/aio-libs/aiohttp CVE-2026-54275
LOW
AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
Record summary
CVE-2026-54275 has a selected CVSS score of 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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Jun 22, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
aiohttpBrowse aio-libs / aiohttp | CVE List | < 3.14.1 | affected |
aiohttpBrowse PyPI / aiohttp | GitHub Advisory | Before 3.14.1 · Fixed in 3.14.1 | affected |
References
2github.comConfirmation
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-4m7w-qmgq-4wj5