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CVE-2026-54274— AIOHTTP: Incomplete websocket frame payloads bypass memory limits

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之前版本存在资源管理错误漏洞，该漏洞源于若攻击者发送大型不完整的websocket帧有效载荷，可能绕过常规内存使用限制。

AI Predicted 7.5 Difficulty: Easy EPSS 0.54% · P43

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
aio-libs aiohttp < 3.14.1 affected
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I. Basic Information for CVE-2026-54274

Vulnerability Information
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Vulnerability Title
AIOHTTP: Incomplete websocket frame payloads bypass memory limits
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, if an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use. 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:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
aio-libs aiohttp 资源管理错误漏洞
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之前版本存在资源管理错误漏洞，该漏洞源于若攻击者发送大型不完整的websocket帧有效载荷，可能绕过常规内存使用限制。
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-2026-54274

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III. Intelligence Information for CVE-2026-54274

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Patches & Fixes for CVE-2026-54274 (1)

Vendor Advisories for CVE-2026-54274 (1)

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

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-2026-54275 AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
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-770

V. Comments for CVE-2026-54274

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