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CVE-2026-54275— AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections

Quick assessment

Affected
aio-libs aiohttp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

aio-libs aiohttp是aio-libs的异步HTTP客户端/服务器框架。 aio-libs aiohttp 3.14.1之前版本存在加密问题漏洞，该漏洞源于TLS SNI检查可能被绕过，当现有连接被重用时，可能导致应用程序对不同server_hostname参数的请求通过重用已拒绝的连接而成功。

AI Predicted 7.4 Difficulty: Easy EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
aio-libs aiohttp < 3.14.1 affected
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I. Basic Information for CVE-2026-54275

Vulnerability Information
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Vulnerability Title
AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
aio-libs aiohttp 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
aio-libs aiohttp是aio-libs的异步HTTP客户端/服务器框架。 aio-libs aiohttp 3.14.1之前版本存在加密问题漏洞，该漏洞源于TLS SNI检查可能被绕过，当现有连接被重用时，可能导致应用程序对不同server_hostname参数的请求通过重用已拒绝的连接而成功。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
aio-libs aiohttp < 3.14.1 -

II. Public POCs for CVE-2026-54275

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III. Intelligence Information for CVE-2026-54275

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Vendor Advisories for CVE-2026-54275 (1)

Same Patch Batch · aio-libs · 2026-06-22 · 9 CVEs total

CVE-2026-54274 AIOHTTP: Incomplete websocket frame payloads bypass memory limits
CVE-2026-54280 AIOHTTP: Payload Response Resources Are Not Closed After Mid-Body Disconnect
CVE-2026-54277 AIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines
CVE-2026-54273 AIOHTTP: HTTP/1 Pipelined Requests Queue Without Limit
CVE-2026-54278 AIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
CVE-2026-54279 AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
CVE-2026-54276 AIOHTTP: DigestAuthMiddleware Applies Credentials to Cross-Origin Redirect Challenges
CVE-2026-50269 AIOHTTP: CRLF injection in multipart headers

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-297

V. Comments for CVE-2026-54275

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