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CVE-2026-54278— AIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup

AI Predicted 7.5 Difficulty: Easy EPSS 0.28% · P20

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProductVersion RangeStatus
aio-libsaiohttp< 3.14.1affected
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I. Basic Information for CVE-2026-54278

Vulnerability Information
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Vulnerability Title
AIOHTTP: Unread Compressed Request Bodies Bypass client_max_size During Cleanup
Source: NVD (National Vulnerability Database)
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, during cleanup it is possible for a compressed request body to be decompressed into memory in one chunk. An attacker may be able to send a compressed payload in specific situations that could be decompressed into memory, potentially leading to DoS (a zip bomb edge case). This vulnerability is fixed in 3.14.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: NVD (National Vulnerability Database)
Vulnerability Title
aio-libs Async http client/server framework 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 Async http client/server framework存在资源管理错误漏洞，该漏洞源于在清理期间可能将压缩请求体解压到内存中，可能导致拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
aio-libsaiohttp < 3.14.1 -

II. Public POCs for CVE-2026-54278

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III. Intelligence Information for CVE-2026-54278

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Patches & Fixes for CVE-2026-54278 (1)

Vendor Advisories for CVE-2026-54278 (1)

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

CVE-2026-54274AIOHTTP: Incomplete websocket frame payloads bypass memory limits
CVE-2026-54280AIOHTTP: Payload Response Resources Are Not Closed After Mid-Body Disconnect
CVE-2026-54277AIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines
CVE-2026-54273AIOHTTP: HTTP/1 Pipelined Requests Queue Without Limit
CVE-2026-54279AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
CVE-2026-54275AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
CVE-2026-54276AIOHTTP: DigestAuthMiddleware Applies Credentials to Cross-Origin Redirect Challenges
CVE-2026-50269AIOHTTP: CRLF injection in multipart headers

IV. Related Vulnerabilities

Same product: aiohttp
Same vendor: aio-libs
Same weakness: CWE-409

V. Comments for CVE-2026-54278

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