Bug 2491468 (CVE-2026-54275) - CVE-2026-54275 aiohttp: AIOHTTP: TLS SNI check bypass via connection reuse
Summary: CVE-2026-54275 aiohttp: AIOHTTP: TLS SNI check bypass via connection reuse
Keywords:
Status: NEW
Alias: CVE-2026-54275
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-22 18:03 UTC by OSIDB Bzimport
Modified: 2026-06-25 12:05 UTC (History)
78 users (show)

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Description OSIDB Bzimport 2026-06-22 18:03:12 UTC 
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.
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