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I. Basic Information for CVE-2026-34517
Vulnerability Information

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Vulnerability Title
AIOHTTP: Late size enforcement for non-file multipart fields causes memory DoS
Source: NVD (National Vulnerability Database)
Vulnerability Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, for some multipart form fields, aiohttp read the entire field into memory before checking client_max_size. This issue has been patched in version 3.13.4.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
aiohttp 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
aiohttp是aio-libs开源的一个开源的用于 asyncio 和 Python 的异步 HTTP 客户端/服务器框架。 AIOHTTP 3.13.4之前版本存在安全漏洞,该漏洞源于对于某些多部分表单字段,aiohttp在检查client_max_size之前将整个字段读入内存。
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 < 3.13.4 -
II. Public POCs for CVE-2026-34517
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III. Intelligence Information for CVE-2026-34517
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V. Comments for CVE-2026-34517

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