CVE-2026-54275
AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-297 |
| Vendor | aio-libs |
| Product | aiohttp |
| Published | Jun 22, 2026 |
| Last Updated | Jun 22, 2026 |
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Affected Versions
aio-libs / aiohttp
< 3.14.1