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GHSA-4m7w-qmgq-4wj5

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

Source: GitHub Advisory Database (reviewed) Low CVE-2026-54275

Packages

EcosystemPackageAffectedFixed in
PyPI aiohttp < 3.14.1 3.14.1

Details

As written in the advisory (Markdown source, shown as plain text).

### 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

References

External links from the advisory. They lead to third-party sites.