CVE-2026-54275
High · 7.5CVSS
7.5
EPSS
0.5%
Published
Jun 22, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Tumbleweed | python-aiohttp | 0 | 3.14.1-1.1 |
Related vulnerabilities
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- CVE-2026-54277 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Also affects python-aiohttp
- CVE-2026-54273 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Also affects python-aiohttp
- CVE-2026-50269 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Also affects python-aiohttp
- CVE-2026-34993 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Also affects python-aiohttp
- CVE-2026-34520 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Also affects python-aiohttp
- CVE-2026-34514 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Also affects python-aiohttp
- CVE-2026-34516 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Also affects python-aiohttp