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I. Basic Information for CVE-2025-43859
Vulnerability Information

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Vulnerability Title
h11 accepts some malformed Chunked-Encoding bodies
Source: NVD (National Vulnerability Database)
Vulnerability Description
h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Vulnerability Title
h11 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
h11是Nathaniel J. Smith个人开发者的一个用Python从头编写的小型HTTP/1.1库。 h11 0.16.0之前版本存在环境问题漏洞,该漏洞源于行终止符解析不当,可能导致请求夹带攻击。
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
python-hyperh11 < 0.16.0 -
II. Public POCs for CVE-2025-43859
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III. Intelligence Information for CVE-2025-43859
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