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python-aiohttp

Python aiohttp versions prior to 3.14.1 contain a vulnerability where the server_hostname TLS SNI check can be bypassed when an existing connection is reused. This allows later requests with different server_hostname parameters to reuse a TLS connection that should have been rejected. The issue is fixed in version 3.14.1.

The aiohttp asynchronous HTTP client/server framework for Python has a vulnerability (CVE-2026-54275) affecting versions prior to 3.14.1. When an application makes multiple requests to the same domain but with different per-request server_hostname parameters, the TLS Server Name Indication (SNI) check can be bypassed if an existing TLS connection is reused. This means that the later requests may succeed without proper TLS hostname verification, potentially undermining TLS security guarantees. The vulnerability is resolved in aiohttp version 3.14.1.

Python aiohttp versions prior to 3.14.1 contain a vulnerability where the server_hostname TLS SNI check can be bypassed when an existing connection is reused. This allows later requests with different server_hostname parameters to reuse a TLS connection that should have been rejected. The issue is f

Python aiohttp: Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused. (CVE-2026-54275)

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