CVE-2026-54275

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.

### Summary The `server_hostname` TLS SNI check can be bypassed when an existing connection is reused. ### Impact 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. ### Workaround Disable keep_alive if you need to change the `server_hostname` check between requests. ----- Patch: https://github.com/aio-libs/aiohttp/commit/0ca2b6c28a25726527a8b60f25960262a91ed0e0

AIOHTTP es un framework HTTP cliente/servidor asíncrono para asyncio y Python. Antes de 3.14.1, la verificación TLS SNI de server_hostname puede ser eludida cuando se reutiliza una conexión existente. Si una aplicación realiza múltiples solicitudes al mismo dominio, pero con diferentes parámetros server_hostname por solicitud, entonces las llamadas posteriores pueden tener éxito al reutilizar la conexión existente cuando deberían haber sido rechazadas debido a la verificación TLS SNI. Esta vulnerabilidad está corregida en 3.14.1.